COT - MATH 2 Q2 W4 ORDER OF OPERATIONS INVOLVING ADDITION AND SUBTRACTION.pptx

ppt

1. Teacher Nissa Belle Magandang buhay !

2. Order of operations Involving Addition and Subtraction

3. MELC: The learner performs Order of Operation s involving Addition and Subtraction of Small Numbers.

4. Directions : Solve the following problem, write your answer in a separate paper. What I Know :

5. 7 + 3 – 5 = ________ 10 – 4 + 6 = _______ 13 + 3 – 2 = _______ 9 + 5 – 4 = ________ 8 – 4 + 7 = ________ 5 12 14 10 11

6. 6. 11 – 3 + 8 = _______ 7. 4 + 5 – 2 = ________ 8. 10 – 7 + 9 = _______ 9. 16 + 7 – 10 = ______ 10. 21 – 10 + 7 = _____ 16 7 12 13 18

7. Directions: Match the two equations/numbers sentences that will give the same answer. Draw a line to connect them. Deve lopment Activities :

8. Pagganyak : Look! Below is a number phrase. It is not a complete number sentence since there is no Answer yet.. FIRST

9. Pagganyak : Try to solve the number phrase that contains both additions and subtraction. FIRST

10. Motivation: 18 – 6 + 3 = _________ 15

11. Motive Questions 1. How will we find the answer to the problem?

12. Motive Questions 2. What do you think will we do first?

13. Lesson Proper In performing two operations in a number sentence the rule for addition and subtraction is as follows:

14. Lesson Proper When addition and subtraction appear in a row, do them in the order that they appear. That is beginning from LEFT to RIGHT

15. Example From the number phase “18 – 6 + = _________” First subtract 6 from 8 18 – 6 + 3 = _______ 12 + 3 = ______ Then add 12 and 3 12 + 3 = 15 The answer is 15

16. Example Example a. 8 + 4 – 6 = _________ 8 + 4 – 6 = __________ 12 - 6 = _______ 6

17. Example Example b. 14 – 5 + 11 = _________ 14 – 5 + 11 = __________ 9 + 11 = _______ 20

18. Post Activity Directions : Write the answer for the first operation you need to do. On the second line, write the final answer. The first number is done for you.

19. 4 – 2 + 5 = _______ _______ 2 7 2. 7 + 3 – 4 = _______ _______ 3. 16 + 12 – 14 = ______ ______ 10 6 28 14

20. 4. 15 – 3 + 10 = ______ ______ 5. 17 + 13 – 19 = _____ ______ 12 22 30 11

21. Modelling Directions : Do the operations in proper order. Encircle your answer.

22. Modelling 1. 5 + 8 – 2 = 11 21 22 2. 25 – 15 + 14 = 16 24 30 3. 24 + 12 – 11 = 18 19 25

23. Modelling 4. 18 – 10 + 13= 21 20 32 5. 16 + 12 – 18 = 10 15 20

24. Group Activity Group 1 : Read the following statements. Identify which operation should be performed first. Write A for Addition or S for Subtraction.

25. Group Activity Group 1 : _______1. What is the differenct when 16 is subtracted from the sum 20 and 30?

26. Group Activity Group 1 : _______2. Subtract 15 from the sum of 18 and 20.

27. Group Activity Group 1 : _______3. The difference of 7 and 3, addred to 6 is what number?

28. Group Activity Group 2 & 3 : Read the problem. Write your answer in a separate paper.

29. Group Activity Group 2 : There are 20 boys and 14 girls in Grade 2 Mayumi Class. If 10 are absent, how many are present?

30. Group Activity Group 2 : Beth has 13 crayons. She gives 3 of them away to Jen. How many crayons does Beth have left?

31. Group Activity Group 3 : 20 Birds were sitting in a tree. 5 more birds flew up to the tree. How many birds were there altogether in the tree?

32. Group Activity Group 3 : 18 children were riding on the bus. At the bus stop, some more children got on the bus. Then there were 25 children altogether on the bus. How many children got on the bus at the bus stop?

33. Abstraction Let us Remember! When a series of operation involving addition and subtraction is given perform the operation as they appear from left to right.

34. Abstraction Let us Remember! 1. What is the rule for performing addition and subtraction in a row?

35. Abstraction Let us Remember! 2. In what direction do you perform addition and subtraction in a row?

36. Abstraction Let us Remember! 3. If you do not perform the operation on the left first, will you come up with the same answer?

37. Assessment: Directions : Answer the questions by performing the proper order of operation.

38. Do you know a person afraid of crossing a bridge? What do we call the fear of crossing bridges?

39. Assessment:

40. Assessment: A 2 + 8 – 3 = ____ 7 _________ B 12 + 13 – 9 = _____ C 18 + 12 – 13 = _____ 16 _________ 17 _________

41. Assessment: D 30 – 20 + 12 = ____ 22 _________ E 17 – 16 + 4 = _____ G 26 – 16 + 13 = _____ 5 _________ 23 _________

42. Assessment: H 10 + 7 – 4 = ____ 13 _________ I 9 – 8 + 13 = _____ O 6 – 3 + 9 = _____ 14 _________ 12 _________

43. Assessment: R 15 + 3 – 9 = ____ 9 _________

44. Karagadagang Gawain Directions : Perform the indicated operations. Write the final answer.

45. Additional Activity: 1. 5 + 4 – 6 = ____ 2. 3 + 6 – 4 = ____ 3. 12 – 6 + 7 = ____ 4. 19 + 7 – 3 = ____ 5. 20 + 4 – 12 = ____