Addition of Fractions (PNSB).ppsx mathematics 5

addition of fraction

1. Philippine National
School for the Blind
(Technology Enhanced Instruction in
Science, English and Mathematics for
Grades IV – VI)
Presented by: Sheryl Grace L. Prades

2. DISSIMILAR FRACTIONS
Addition
of

3. Use this presentation to teach the steps for
adding and subtracting fractions with unlike
denominators.
It is assumed that students have a thorough
understanding of the process for making
equivalent fractions.
NOTE:

4. We need a common
denominator to add
these fractions.
1
2
1
3

5. 3, 6, 9, 12, 15, 18…
2, 4, 6, 8, 10, 12, 14, 16, 18, 20
We need a common
denominator to add
these fractions.
1
2
1
3

6. 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
The first number IN COMMON
that appears on both lists
becomes the common denominator
3, 6, 9, 12, 15, 18…

7. 1
2
1
3
The new denominator
would be 6
Then divide 6 by to 2
then multiply with 1.
6 / 2 x 1 = 3
6 / 3 x 1 = 2
(Do the same with the
second addend)
Add the numerator
3 + 2 = 5
5
6
6
3
6
2

8. Another Way

9. Using
Equivalent
Fractions

10. We need a common
denominator to add
these fractions.
5, 10, 15, 20, 25, 30, 35, 40, 45
7, 14, 21, 28, 35, 42, 49, 56, 63
3
7
1
5

11. x 7
x 7
X 5
x 5
15
7
15 + 7 = 22
22
3
7
1
5
35
35
35

12. We need a common
denominator to add
these fractions.
7, 14, 21, 28, 35, 42, 49, 56, 63
8, 16, 24, 32, 40, 48, 56, 64, 72
4
7
3
8

13. x 7
x 7
x 8
x 832
21
32 + 21 = 53
53
4
7
3
8
56
56
56

14. TRY THESE
A
F
EB
C
D

15. Each click on the next slide
reveals an answer.
Check your papers.
If you discover an incorrect
answer, be able to explain your
mistake.

16. TRY THESE
A
F
EB
C
D
17
27
19
20
10
9
41
28
26
21
13
12

17. Good job!!!