mathematics tricks for grade7class_trick.ppt

mathematics trics

1. Magician
or
Math-a-
magician?

4. General Tips for Studying Mathematics
1.Go To Class regularly
2.Get to Class On Time.
3.LISTEN During Class.
4.Take Good Notes.
5.Ask Questions.
6.Listen When Others Ask Questions.
7.Review Notes After Class.
8.Make a Set of Index Cards.
9.Learn The (Proper) Notation.
10.Get Into A Study Group.
11.Note Due Dates.
12.Budget Adequate Time For Studying/Homework.
13.Do Homework After Each Class. 
14.Do Homework Without Notes and Book.
15.Do More Homework. 
16.Practice, Practice, Practice.
17.Persevere Keep Old Homework and Exam Papers.
18.Don’t Forget Your Textbook.
19.Seek Help If You Need It.
20.Seek Help If You Need It . You should always do the best that you can
and strive for the best grade that you can possible get.

5. Study Tips for Math
1.Always
read math problems completely before beginning any calculations. 
If
you "glance" too quickly at a problem, you may misunderstand what really
needs
to be done to complete the problem.
2.Whenever
possible, draw a diagram.  Even though you may be able to
visualize
the situation mentally, a hand drawn diagram will allow you to label
the
picture, to add auxiliary lines, and to view the situation from different
perspectives. 
3.Do
not feel that you must use every number in a problem when doing your
calculations.
Some mathematics problems have "extra" information.  These
questions
are testing your ability to recognize the needed information, as
well
as your mathematical skills. 
4.Remain
confident!  Do not get flustered!  Focus on what you DO know, not
on
what you do not know.  You know a LOT of math!! 
5.If
you are "stuck" on a particular problem, go on with the rest of the test. 
Oftentimes,
while solving a new problem, you will get an idea as to how to
attack
that difficult problem. 
6.In
certain problems, you may be able to "guess" at an approximate (or
reasonable)
answer.  After you perform your calculations, see if your final
answer
is close to your guess.   

7. Fear of Maths is only mental
I suggest:
1.Instead of saying DIVIDE BY 2, say HALF/HALVE IT.
2.Instead of saying MULTIPLY it by 2, say DOUBLE IT.
3.Never use more than two digit numbers to prove the
working of a method.
4 .Show the more interesting sides of maths, for example,
show the beauty of the table of nine (which really looks
cute, simple and well arranged).
After these small things, leave the person to grow up
inside herself, by herself. They’ll start with small
victories, and keep gathering courage for bigger ones.
Maths is easy and beautiful up to a certain level. Let’s all
enjoy this beautiful, universal language.

8. Tough Multiplication
If you have a large number to multiply and one
of the numbers is even, you can easily subdivide
to get to the answer:
32 x 125, is the same as:
16 x 250 is the same as:
8 x 500 is the same as:
4 x 1000 = 4,000
Tough Multiplication

9. Multiply
by 5: Multiply by 10 and divide by 2.
Multiply
by 6: Sometimes multiplying by 3 and then 2 is easy.
Multiply
by 9: Multiply by 10 and subtract the original number.
Multiply
by 12: Multiply by 10 and add twice the original number.
Multiply
by 13: Multiply by 3 and add 10 times original number.
Multiply
by 14: Multiply by 7 and then multiply by 2
Multiply
by 15: Multiply by 10 and add 5 times the original number, as
above.
Multiply
by 16: You can double four times, if you want to. Or you can
multiply
by 8 and then by 2.

10. Multiply
by 18: Multiply by 20 and subtract twice the original number
Multiply
by 19: Multiply by 20 and subtract the original number.
Multiply
by 24: Multiply by 8 and then multiply by 3.
Multiply
by 27: Multiply by 30 and subtract 3 times the original
number
Multiply
by 17: Multiply by 7 and add 10 times original number.
Multiply
by 45: Multiply by 50 and subtract 5 times the original
number
Multiply
by 90: Multiply by 9 (as above) and put a zero on the right.
Multiply
by 98: Multiply by 100 and subtract twice the original
number.
Multiply
by 99: Multiply by 100 and subtract the original number
Assorted Multiplication Rules

11. When solving absolute value inequalities: if the
absolute value is greater than a number you must
use the conjunction (OR),
when the absolute value is less than a number you
 must use the conjunction AND.
To remember this just remember two words
"GOR"-"LAND," which translate into "G(greater)OR"
and "L(less than)AND."
When I introduce this topic I tell students that
we are about to enter "GOR-LAND." (no political
implications intended)

12. Simple Multiplication Verification Method
How
do you verify your multiplication? Here is a simple method.
Always
reduce computations to a 
single digit.
 
 43  
 x
92
 3956
Add
the digits of multiplicand i.e. 4 + 3 = 
7
Add
the digits of multiplier i.e. 9 + 2 = 
11 
 then
reduce to a single digit  1 +1 = 
2
Multiply
 2 x 7 = 
14  then
reduce to a single digit  1 + 4 =
 
5
Add
3+9+5+6 = 
23  then
reduce to a single digit  2 + 3 = 
5
Both
numbers (
5)
are equal, therefore multiplication is correct

13.  A=(pi)r^2  Apple pies r square
 A=(pi)r*r  Apple pies r round
 C= (pi)d  Cherry pie delight
 I = p r t  I "am" p-r-t
 pronounced I am pretty
 rt = d  rt are d
 pronounced retard
Quadratic formula :
"X equals to
negative
b Plus or minus the square root,
Of
b squared minus four a c All over 2 a"
Formulas For Easy Remberence

14. supplementary and complimentary angles 

 I teach middle school students. My students know that
 Supplementary and complimentary angles are angles that equal 90
degrees and 180degrees, but they get confused as to which is which.
 They also know that 90 degree angles are right angles.
 So I tell them that a compliment is the right thing to do, and right angles
 equal 90degrees, therefore complimentary angles are two angles that
equal 90 degrees.

A. Then they know that 180 degrees is the other one, supplementary.
"Complementary" - early in the alphabet, so = 90degrees.
B."Supplementary“ - later in the alphabet, so = 180degrees.

15. Triangle Names 
o Equilateral triangles have 3 sides and 3
angles equal.
o Isosceles triangles have 2 sides and
o 2 angles equal.
o Scalene triangles have 0 sides and 0 angles
equal.
o So, to remember them in that order, EIS, "Eat
ice slowly"

16.  just see whether the product of coefficients
of x in both the equations is equal to that
of coefficients of y.
 If
the given lines are


ax+by+c=0
and
bx+ay+d=0

 they

cut
the axes in concyclic points.

18. Convert 10 decameters to centimeters.
Set up the columns as shown below
so that the ones column comes under deca.
Move the decimal point to the
right of the column with centi.
Add zeros until you are under centimeters.
That is your answer.
Kilo hecta deca unit deci centi milli
1 0
Kilo hecta deca unit deci centi milli
1 0 0 0 0
i.e. 10 dam = 10 000 cm

Example

19. Km Hm Dam M Dm Cm Mm
To convert...3.75 Hm = ______ Cm
It is 4 jumps to the right from Hm to Cm,
Simply move the decimal 4 jumps to the right.
3.75 Hm = 37,500. Cm
0.59 Dm = _______ HmI
It's 3 jumps to the left from Dm to Hm,
Simply move the decimal 3 jumps to
the left .
0.59 Dm = 0.00059 Hm
“King Henry Died Monday Drinking Chocolate Milk"

20. LET THE NUMBER BE XYZ.
SQ (XYZ) is calculated like this.
STEP 1. Last digit =  last digit of SQ(Z)
STEP 2. Second Last Digit = 2*Y*Z + any carryover from step1

STEP 3. Third Last Digit 2*X*Z+ Sq(Y) + any carryover from
STEP 2
STEP 4. Fourth last digit is 2*X*Y + any carryover from STEP3

STEP 5 . In the beginning of result will be Sq(X) + any
carryover 

from Step 4.
TO FIND SQUARE OF A 3 DIGIT NUMBER

21. TO FIND SQUARE OF A 3 DIGIT NUMBER :
EXAMPLE :
SQ (431)
STEP 1). Last digit =  last digit of SQ(1) =1


STEP 2). Second Last Digit = 2*3*1 + any carryover from STEP1


= 6


STEP 3). Third Last Digit 2*4*1+ Sq(3) + any carryover from STEP2 


= 2*4*1 +9= 17. so 7 and 1 carryover


STEP 4). Fourth last digit is 2*4*3 + any carryover  (which is 1)
= 

24+1=25. So 5 and carry over 2. 


STEP 5) . In the beginning of result will be Sq(4) + any carryover 


from Step 4. So 16+2 =18.
So the result will be  185761.

22. Special Numbers
 e to 15 decimal places e=2.718281828459045... 


Andrew
Jackson was the 7th president, elected in
1828
to two terms. Then tack on the 45-90-45 right triangle.
• pi - first eight digits of pi by
K.Mahadevan,PGT


to
get the first eight digits of pi,
count
the number of letters in each word of this phrase:
• May(3)
I(1) have(4) a(1) large(5)container(9) of(2)
coffee(6)?

23. PROFIT AND LOSS :
Suppose the price is first increase by X%  and then decreased 
by Y% , the final change % in the price is given by the following 
formula.
Final Difference % = X- Y – XY/100.
EXAMPLE 1. : The price of T.V set is increased by 40 % of the 
cost price and then decreased by 25% of the new price .  On 
selling, the profit for the dealer was Rs.1,000 . At what price was 
the T.V sold.
From the above mentioned formula you get : 
Final difference % = 40-25-(40*25/100)= 5 %.
So if 5 % = 1,000
then 100 % = 20,000.
C.P = 20,000
S.P = 20,000+ 1000= 21,000.

24. The price of T.V set is increased by 25 % of cost 
price and then decreased by 40% of the new price .  On selling, 
the loss for the dealer was Rs.5,000 . At what price was the T.V 
sold?
From the above mentioned formula you get : 
Final difference % = 25-40-(25*45/100)=  -25 %.
So if 25 % = 5,000
then 100 % = 20,000.
C.P = 20,000
S.P = 20,000 – 5,000= 15,000.
EXAMPLE 2 :

25. TRY THESE
Now find out the difference in % of  a product which was  :
1)First increased by 20 % and then decreased by 10 %. 
2)First Increased by 25 % and then decrease by  20 %
3)First Increased by 20 % and then decrease by  25 %.
4)First Increased by 10 % and then decrease by  10 %.
5)First Increased by 20 % and then decrease by  15 %. 

26. TIME AND WORK:
1.   If A can finish work in X time  and B can finish work in Y time 
then both together can finish work in (X*Y)/ (X+Y) time.
2.   If A can finish work in X time and A and B together can finish 
work in S time then B can finish work in (XS)/(X-S) time.
3.   If A can finish work in X time and B in Y time and C in Z time 
then they all working together will finish the work in
(XYZ)/ (XY +YZ +XZ) time
4.    If A can finish work in X time and B in Y time and A,B and C 
together in S time then :
C can finish work alone in (XYS)/ (XY-SX-SY)
B+C can finish in (SX)/(X-S)
and A+ C can finish in (SY)/(Y-S)

27. TYPE 1 :  Price of a commodity is increased by r%. By how 
much % should the consumption be reduced so that the 
expense remain the same.
TYPE 2 :  Price of a commodity is decreased by r %. By how 
much % can  the consumption be increased so that the expense 
remain the same.
Solution :  
TYPE1 :   (100* r ) / (100+r)
TYPE 2 :   (100* r ) / (100-r)
PERCENTAGE

28. Example
Solution :  
TYPE1 :   (100* 60 ) / (100+60) = 37.5 %
TYPE 2 :   (100* 60 ) / (100-60) = 150  %
TYPE 1 :  Price of a commodity is increased by 60 %. By how 
much % should the consumption be reduced so that the 
expense remain the same.
TYPE 2 :  Price of a commodity is decreased by 60 %. By how 
much % can  the consumption be increased so that the expense 
remain the same.

29. 1)Apollonius theorem could be applied to the 4 triangles
formed in a parallelogram.
2)Area of a trapezium = 1/2 * (sum of parallel sides) * height
= median * height
where median is the line joining the midpoints of the
oblique sides.
3)Let W be any point inside a rectangle ABCD . Then
4)Let ‘ a’ be the side of an equilateral triangle.
Then if three circles be drawn inside this triangle touching
each other then each’s radius =
2
WA
2
WC
2
WB
2
WD 
132
a
Geometry

30. Successive
discounts
Suppose
in 1999 population increases by x% and then in
2000
by y%
so
the population in 2000 now is
more
that was in 1999.
Suppose
in 1999 population decreases by x% and then in
2000
by y%
so
the population in 2000 now is
less
that was in 1999.
In
1999 population increases by 10% and then in 2000 by
5%
so the population in 2000 now is 10+5+(50/100)=+15.5%
more
that was in 1999.
 If
there is a decrease then it will be preceded by a negative
sign
and likewise.
100
)(
xy
yx 
100
)(
xy
yx 

31. Fibonacci Addition Trick
Step 1: Choose two numbers
Step 2: Form a Fibonacci sequence for ten numbers
Example, I choose number 5 for my first number
and 6 for my second number.
Then I add the numbers to get a Fibonacci sequence.
5+6 gives my 3
rd
 
number which is 11;
6+11 gives me my 4
th
 
number which is 17.
The entire sequence is as follows:
1st – 5,2nd – 6, 3rd – 11, 4th – 17,5th – 28,6th - 45
7th – 73,8th – 118, 9th – 191,10th – 309.
What is the sum of all these 10 numbers? (6 seconds)
The answer will also be 803.
Trick: Multiply 7
th
number by 11 and the answer is 803.
(It is true is any set of ten Fibonacci numbers)

32. Fractions Decimals Percents
1/2 .5 50%
1/3 .3 33.3%
2/3 .6 66.6%
1/4 .25 25%
3/4 .75 75%
1/5 .2 20%
2/5 .4 40%
3/5 .6 60%
4/5 .8 80%
1/6 .16 16.6%
5/6 .83 83.3%
1/8 .125 12.5%
3/8 .375 37.5%
5/8 .675 62.5%
7/8 .875 87.5%
1/9 .1 11.1%
1/10 .1 10%
1/11 .09 9.09%
1/12 .083 8.3%
1/16 .0625 6.25%
1/20 .05 5%
1/25 .04 4%
1/50 .02 2%
Conversion
of Fraction into Decimals and Percents

33. Labeling Right Triangles
Let’s put it all together.
Given that angle B is the reference angle, here is
how you must label the triangle:
A
B (ref. angle)
C
hypotenuse
opposite
adjacent

34. Labeling
Right Triangles
Let’s
put it all together.
Given
that angle C is the reference
angle,
here is how you must label the
triangle:
A
B
C (ref. angle)
hypotenuse
opposite
adjacent

35. There are three ratios that you need to
learn:
sin
o
yp
pp
h
 cos
a
yp
dj
h
 tan
o
dj
pp
a


Where are the hypotenuse, adjacent and opposite lengths.
This is opposite the right-angle
This is next to the angle
Th
is is o
ppo
site th
e a
n
g
le. TRIGONOMETRY

36. A
PHARSE TO REMEMBER THE ABOVE
DEFINITION
OF TRIGONOMETRIC RATIOS
SOME
OLD HORSES


CAN
ALWAYS CAN HEAR


TREIR
OWNER’S APPORACH
sin
o
yp
pp
h

cos
a
yp
dj
h

tan
o
dj
pp
a


37. Math Magic – Trick 1
Pick a number… any number! (keep it a
secret though) say x
Add 1 to that number i.e. x+1
Multiply by 3 i.e.3x + 3
Subtract your ‘secret’ number i.e. 2x +3
Add 5 i.e. 2x + 8
Divide by 2 i.e. x + 4
Subtract your secret number. i.e. 4
The answer is always 4

38. Everyone needs a little humor in their life
Especially mathematicians
Trick1.Viral Math
Challenge : Can
you find the answer to this problem?
Trick:2.
Write
down a three digit number. The first and third digits must
differ
by more than one. Example: 264
Now reverse the digits to
form a second number. we get 462.
Subtract
the smaller number from the larger one.  462 - 264 = 198
Now reverse the
digits in the answer you got in step 3 and add it to
that
number. : 891 + 198 = 1089

39. Fast
Multiplication
Select
a four-digit number
Example : 2345 
Any
4 digit number is multiplied by 10001.what will be the
answer
? Do you know the answer is amazing?
The
answer will be the given four digit number is written twice in
the
same order .
2345


10001 = 23452345
Since
10001 = 73 x 137, 2345

73

137 = 23452345
abcd


73 x 137 = abcdabcd.
Entering
a four-digit number twice (23452345) will be divisible by
73,
137, and the original four-digit number.
1234


73

137 = 12341234
Can
you tell me 26852685 is divisible by 73?
Can
you tell me 81948194 is divisible by 137?
Can
you tell me 38293829 is divisible by 3829?

40. Select
a three-digit number
Example : 234 
Any
4 digit number is multiplied by 1001.what will be the answer ?
Do
you know the answer is amazing?
The
answer will be the given three digit number is written twice in the
same
order .
234
1001 = 234234
Since
1001 = 7 x 11
13,
234

7 x 11
13
= 234234
abc


73 x 137 = abcabc.
Entering
a three-digit number twice (234234) will be divisible by 73, 137,
and
the original three-digit number.
123


7 x 11
13
= 12341234
Can
you tell me 685685 is divisible by 7?
Can
you tell me 194194 is divisible by 13?
Can
you tell me 829829 is divisible by 829?
Can
you tell me 529529 is divisible by 11?
Fast
Multiplication/Division

41. Fast
Multiplication/Division
Select
a two-digit number
Example : 23 
Any
2 digit number is multiplied by 10101.what will be the answer ?
Do
you know the answer is amazing?
The
answer will be the given two digit number is written thrice in the same
order
.
23


10101 = 23 2323
Since
10101 = 21 x 37
13,
23

3

7 x 37
13
= 232323
ab


37 x 13

21 = ababab.
Entering
a two-digit number thrice (232323) will be divisible by 37, 13, 7, 3

and the original two-digit number.
12


3

7 x 37
13
= 121212
Can
you tell me 686868 is divisible by 7?
Can
you tell me 191919 is divisible by 13?
Can
you tell me 828282 is divisible by 82?
Can
you tell me 525252 is divisible by 7?
Can
you tell me 757575 is divisible by 21?

42. STEP 1: 

Ask participants to write down their mobile number .
STEP 2 
:
Ask them to add the digits.
 
STEP 3 
:
Ask them to subtract this number from the original one.
STEP 4 :Ask them to select any digit from this new number and strike it
out, without showing you.
STEP 5 :Ask them to add the remaining digits and write down the answer
they get. Example: 8+3+9+7+0+7+0 = 34
STEP 6 :Ask them to tell you the number they get (34) 
and you will tell them which number they struck out.
MISSING
DIGIT TRICK

43. TRICK Hate 8 *
Ask
your friend to choose a number between 1 and 9 except 8
Multiply
the number by 
9.
7 x 9 = 63
•Multiply
the answer by 12345679  (no 8)
63 x
12345679 =  magic!
Select
another number say 6
6

x
9 = 54
54

x
12345679 = 666666666
1

x
9 x 12345679 = 111111111
2

x
9 x 12345679 = 222222222
• Can
you find the value of the following?
3

x
9 x 12345679
4

x
9 x 12345679
5

x
9 x 12345679
9

x
9 x 12345679

44. Dice Magic*
Find
three dice and a friend. Turn your back.
Ask
your friend to roll the three dice so that you can't see the
resulting
numbers.
Multiply
the number on the 
first die
by 2.Add 5.Multiply by 5   
*
Add the number on the 
second
 
die .Multiply
by 10   
*Add
the number on the 
third
 
die.
Subtract 250 .
Now
you are able to tell numbers on the top of three dice.
Now
for your magic prognostication.
 Example

(5
x 2 + 5) x 5 + 3 x 10 + 4 -250 = 534
Now
you are able to tell numbers on the bottom of three dice.
i.e.
243
 Magic
happens...all the time!

45. Calculating Dice*
1.Find three dice,
a calculator and a friend.
Roll
the three dice and write down this number.
Repeat
this number.
2.Now
roll one dice and multiply your number by this roll.
3.Divide
this number by 11
Divide
this number by 13
Divide
this number by
 your
single dice roll and divide by 7
4.Magic
happens!
 
5.The
magic is the three digit number appeared on three dice
6.Example:
123, 123123
7.123123
x 5 = 615615
8.615615/11=
55965, 55965/13 = 4305. 4305/5=861 , 861/7=123

46. Roll Them*
Ask
your friend to roll the dice 
without revealing
 
to
you the numbers
Example
 
:
Your friend rolls a 
4 and
a 
6.
Ask
your friend to multiply the number on the 
first
die
 by 2
4
x 2 = 8. Add 
5
 
8
+ 5 = 13
Multiply
by 
513
x 5 = 65
Add
the number on the 
second
die
.
i.e. 65 + 
6 =
71
You
can now predict the numbers on the two dice.
Here
is what you must do:
Subtract 25 
71
- 25 = 46
4 = first die
6 = second die.

47. Mobile
number Trick


1)Insert
in the 
first
five digits
 of
your phone number (
not
 
the
area code)


Example
 : 94456


2)Multiply
these three numbers  by 
80  94456
x 80 = 7556480


Add 1  7556480
+1 = 75564801


3)Multiply
by 
2500  75564801
x 2500 = 18891202500


4)Add
to this the 
last
4 digits
 of
your phone number

18891202500 + 06533 = 18891209033


5)Add
again the 
last
4 digits
 of
your phone number.

18891209033 + 06533= 18891215566


6)Subtract 2500

18891215566 - 2500 = 18891213066
7&.
Divide number by 
2

18891213066 / 2 =  Magic phone number = 9445606533

48. Math mentalism to amaze everyone
1-
Ask a participant to choose a four digit number
2-
Write down your prediction.
3-
Ask participant to choose another four digit number
4-
Write down your own number under the participants number.
5-
Ask participant to choose another four digit number.
6-
Write down your own number under the participants number.
7-
Total the five numbers.
8-
Show your prediction and exchange high fives!
 
You
are now a Mathalism specialist.
Example:
i.2345
ii.22343
iii.7123
iv.2876
v.5690
vi.4309
vii.2345
+ 7123 +
2876
+ 5690 + 4309 = Answer in step ii

49. i.
1)Use three dice. 
2)Have
a friend roll the dice and then stack them one on top of the other.
 
3)Tell
your friend that you can not see
 five
faces
 of
the dice.
4)
The 5 numbers
 
 
you cannot see are
:
 

i)the bottom of the top dice; the top of the second dice
 

ii) the bottom of the second dice; the top of the last dice

iii) the bottom of the last dice
You
will now predict the
 total of
the five hidden numbers.
5)In
your head subtract the very top face of the three dice from
 21.
 
6)The
answer will be
 the
total of the five hidden numbers.


Reason
is


7)
The sum of the numbers of opposite faces on each die is 7
Dice Math Trick

51. The Locker Problem
As 500 students enter a school, they pass
lockers that are numbered from 1 to 500. The
first student opens every locker; the second
student closes every second locker; the third
student changes the position of every third
locker (by opening the closed lockers and
closing the open lockers); and the fourth
student changes the position of every fourth
locker. This pattern continues for all 500
students. Which lockers are open after all
students enter the school?

53. The Hat Problem
There are 100 people lined up on the steps of a stadium,
each on a different step, all looking down toward the field so
that they can see everyone in front of them, but no one
behind them. Each person will be given either a red or black
hat. We do not know the total number of red or black hats.
Each person will not be able to see the color of his own hat
(or the ones behind him), but will be able to see the colors of
all the hats in front of him.
Starting in the back, the last person will be asked what color
hat he is wearing. If he guesses correctly, he will live; if he
guesses incorrectly, he will be shot immediately. The second
to last will be asked, and so on, until we reach the person on
the bottom step. Each person will be able to hear what all
the people behind him say, and will also be able to hear
which people behind him were shot.

54. The Hat Problem
Before we begin this process, the 100 people may
meet to discuss a strategy. They can plan whatever
they want, but once the line-up begins, they may no
longer confer. At each person's turn, he may only say
"black" or "red," and no other words -- if he says
anything else, all 100 people will be executed. He
may also not use tone of voice, volume, etc., to
convey any meaning -- this will be detected and they
will all be shot.
What strategy will guarantee saving the maximum
number of people? What is this number?

56. A Familial Math Equation
A mother is 21 years older than her son
In 6 years, she will be 5 times older than him
Where is the father?

57. A Familial Math Equation
Let x = the age of the mother (in years)
Let y = the age of the son (in years)
x = 21 + y
x + 6 = 5(y + 6)
Therefore,
(21 + y) + 6 = 5(y+6)

58. A Familial Math Equation
y + 27 = 5y + 30
5y – y = 27 – 30
4y = -3
y = -3/4
Remember that y is expressed in years…

59. The obvious solution may be correct,
but where’s the fun in always being right?

60. Math Quiz Answers
1) There are 8 apples on the table, you take away 3.
How many do you have?
3
– The other 5 are still on the table

61. Math Quiz Answers
2) There are 10 birds in a field. If 2 are shot, how
many are left?
2
– The others have flown away

62. Math Quiz Answers
3) Take away the first letter, take away the last
letter, then take away all the other letters. What
do you have left?
The
mailman
http://www.curiousmath.com

63. Math Quiz Answers
4) If you have 4 melons in one hand, and 7 apples
in the other - What do you have?
Big
hands
http://www.curiousmath.com

64. Math Quiz Answers
5) A box holds nine ears of corn. A squirrel carries
out three ears a day, but it takes him nine days to
carry out all the corn. Why?
He
carries out one ear of corn
in
addition to his own two ears

65. Math Quiz Answers
6) Why do white sheep eat more than black sheep?
There
are more white sheep than black sheep.

66. Math Quiz Answers
7) It takes 7 men 2 hours to build a wall. How long
does it take 3 men to build the same wall?
Why
bother? The 7 men have already built it.

67. Math Quiz Answers
8) I have 2 coins in my hand that add up to 60
cents. One of the coins is not a half dollar. What
are the coins?
A
half dollar and a dime
one
(the dime) is not a half dollar

68. Math Quiz Answers
9) A man wanted to plant 4 trees, but all 4 had to
be equal distances from each other. How did he
do it?

69. Math Quiz Answers
10) A fisherman was asked the length of the fish he
had caught. He said "it is 30 cms plus half its
length.“
How long was the fish?
60
cms

70. Math Quiz Answers
11) What comes next in the following sequence ?
1, 4, 5, 6, 7, 9, 11,...
100
– the next number spelled without a t

71. Math Quiz Answers
12) In a scientific context, what could the following
phrase mean?
“How I want a drink, alcoholic of course, after
the heavy chapters involving quantum
mechanics…”
π
= 3.14159265358979…