Power point demonstration of Subtraction of Integers.pptx

Subtraction of Integers

1. MATHEMATICS 7

2. OBJECTIVES Find the difference of integers using signed tiles. 1 1 2 3 Solve problems involving subtraction of integers. Subtract integers using local tourist spots.

3. Add the problems mentally. Give Me More! 3 + (-1) = ACTIVITY 1

4. Give Me More! Add the problems mentally. -3 + 1 = ACTIVITY 1

5. Give Me More! Add the problems mentally. 3 + 1 = ACTIVITY 1

6. Give Me More! Add the problems mentally. (-3) + (-1) = ACTIVITY 1

7. Which is Which? Directions   Each group is given 2 flags, a yellow and a pink. The yellow represents positive number and the pink represents negative number. ACTIVITY 2 2. As the teacher presents the statement, each group must determine if the situation represents positive or negative.

8. Which is Which? Directions   3. The first group to raise the correct flag will be given the chance to tell the integer being represented in the problem. ACTIVITY 2 4. Each correct answer is equivalent to 1 point. The group with the highest score will be declared as the winner.

9. Which is Which? SITUATION 1 ACTIVITY 2 P70 savings in the piggy bank +70

10. Which is Which? SITUATION 2 ACTIVITY 2 Borrowing P15 from your classmate to buy hamburger. -15

11. Which is Which? SITUATION 3 ACTIVITY 2 P20 allowance in your pocket +20

12. Which is Which? SITUATION 4 ACTIVITY 2 Moving three steps forward in forming a line. +3

13. Which is Which? SITUATION 5 ACTIVITY 2 Decrease five points in your Quarter 2 Math grade -5

14. Missing Piece! ! DIRECTIONS ACTIVITY 3 1. Each group is given a set of tiles. The white part represents positive numbers, and the black part represents negative numbers. A pair of black and white tiles represent a zero. 2. As the teacher flashes the number sentence, each group must show the tiles representing the minuend.

15. Missing Piece! ! DIRECTIONS ACTIVITY 3 3. Afterwards, you are going to take away the number of tiles representing the subtrahend from the minuend. 4. If the number of tiles in the minuend is not enough, you are going to add specific number of zeroes depending on the lacking tiles from the minuend. 5. The number of tiles left represent the answer.

16. Missing Piece! ! PRACTICE ACTIVITY 3 2 – 5 = -3

17. Missing Piece! ! 1 . 3 – 1=___ ACTIVITY 3 NUMBER SENTENCE 2

18. Missing Piece! ! 2 . (-3) – (-1)=___ ACTIVITY 3 NUMBER SENTENCE -2

19. Missing Piece! ! 3 . 3 – (-1)=___ ACTIVITY 3 NUMBER SENTENCE 4

20. Missing Piece! ! 4 . (-3) – 1=___ ACTIVITY 3 NUMBER SENTENCE -4

21. LET US COMPARE! SUBTRACTION 3 - 1 = 2 -3 - (-1) = -2 3 - (-1) = 4 -3 - 1 = -4 Activity 3 ADDITION 3 + (-1) = 2 -3 + 1 = -2 3 + 1 = 4 -3 + (-1) = -4 Activity 1 Keep Change Change

22. LET’S CLARIFYFACTS! ! SUBTRACTION OF INTEGERS

23. LET’S CLARIFYFACTS! ! SUBTRACTION OF INTEGERS What is the general rule in subtracting integers?

24. LET’S CLARIFYFACTS! ! SUBTRACTION OF INTEGERS Use Keep Change Change (KCC) • Keep the 1st integer the same • Change the subtraction sign to addition • Change the sign of the second integer

25. LET’S CLARIFYFACTS! ! SUBTRACTION OF INTEGERS Subtraction Rule: - To subtract two integers, add the opposite or additive inverse of the subtrahend to the minuend. That is, if a and b are any two integers, then, a – b = a + (-b). Then, follow the rules for addition of integers.

26. EXAMPLE! ! SUBTRACTION OF INTEGERS 10 – 6= 10 + + + + + + + + + + - 6 + + + + + +

27. EXAMPLE! ! SUBTRACTION OF INTEGERS 10 – 6= 10 + + + + + + + + + + + -6 + + + + + 4

28. EXAMPLE! ! SUBTRACTION OF INTEGERS 5 – 6= 5 + + + + + - 6 + + + + + +

29. EXAMPLE! ! SUBTRACTION OF INTEGERS 5 – 6= 5 + + + + + + -6 + + + + + -1

30. LET’S WORK TOGETHER ! ! Sylvia visits Buri Baras Beach to attend her friend’s birthday. She has 70 pesos in her pocket. If the fare from Catbalogan terminal to Brgy . Silanga is 25 pesos and from Brgy . Silanga to Buri Beach is 20 pesos and she will be paying 10 pesos for the entrance fee. Is her money sufficient for her to return home?

31. LET’S WORK TOGETHER ! ! Multiple choice Direction: Read and analyze each question. Choose the correct answer by writing it in a ¼ sheet of paper.

32. LET’S WORK TOGETHER ! ! What is the difference between 20 and -9? 11 29 -11 -29

33. LET’S WORK TOGETHER ! ! What is the difference between 20 and -9? 11 29 -11 -29

34. LET’S WORK TOGETHER ! ! 3. Find the difference of -8 and -15. 7 -7 -13 -23

35. LET’S WORK TOGETHER ! ! 4. Find the difference between the mountain that has an altitude of 3486 feet and a valley that is 139 feet below sea level. 3,265 3,347 3,437 3,625

36. LET’S WORK TOGETHER ! ! 5. The record high temperature for Catbalogan City is 104 degrees Fahrenheit. The record low is -18 degrees Fahrenheit. What is the difference between high and low? 122 -122 96 -96

37. LET’S Practice at HOME ! ! What is the name of the 4th highest mountain in the world? (Decode the answer by finding the difference of the following subtraction problems. Write the letter to the answer corresponding to the item in the box provided below: O Subtract (-33) from 99 L Subtract (-30) from 49 H 18 less than (-77) E Subtract (-99) from 0 T How much is 0 decreased by (-11)? S (-42) – (-34) – (-9) - 18

38. Thank You class!