MDAS (Multiply, Divide, Add ànd Subtract 37.pptx

Review of lesson

1. MATH CLASS GRADE 4 Teacher Doris

2. PERFORMING SERIES OF OPERATIONS

3. MULTIPLY 3 x 10 5 x 7 8 x 8 10 x 10 9 x 6 7 x 8 6 x 5 4 x 9

4. DIVIDE 36 ÷ 9 20 ÷ 4 27 ÷ 3 18 ÷ 8 35 ÷ 5 49 ÷ 7 64 ÷ 8 50 ÷ 5

5. ADD 9 + 9 10 + 6 7+ 8 9 + 8 4 + 7 8 + 5 4 + 4 6 + 8

6. SUBTRACT 10 - 7 9 - 6 20 - 5 19 - 10 14 - 7 11 - 5 12 - 4 16 - 8

7. 4 PICS 1 WORD Add

8. 4 PICS 1 WORD Divide

9. 4 PICS 1 WORD Multiply

10. 4 PICS 1 WORD Subtract

11. 4 PICS 1 WORD Subtract

12. 4 PICS 1 WORD Operations

13. Have you experienced being absent from school because you were sick? How did you feel if you miss the lesson /test?

14. Tessie was absent because she was sick. When she went back to school, she had to take the test. Items for the test given are shown below.

15. 2 x 6 ÷ 4 5 x 4 -16 + 8 9 – 7 + 3 18 – 12 ÷ 6 + 7 18 – 12 + 2 16 ÷ 4 x 5 – 7+8

16. Do you think Tessie can answer the test correctly? Why ? What do you think will she do? If you were her classmate, what would you do to help her? How do you feel if you help someone?

17. Let’s help Tessie solve her problem. 2 x 6 ÷ 4 5 x 4 -16 ÷ 8 9 – 7 + 3 18 – 12 ÷ 6 + 7 18 – 12 ÷ 2 16 ÷ 4 x 5 – 7+8

18. Let’s help Tessie solve her problem. 2 x 6 ÷ 4 =12 ÷ 4 = 3

19. 9 – 7 + 3 = 2 + 3 = 5

20. 18 – 12 ÷ 2 = 18 - 6 = 6

21. 5 x 4 -16 ÷ 8 = 20 – 16 ÷ 8 = 20 – 2 = 22

22. 18 – 12 ÷ 6 + 7 = 18 – 2 + 7 = 16 + 7 = 23

23. 16 ÷ 4 x 5 – 7+8 = 4 x 5 – 7 + 8 = 20 – 7 + 8 = 13 + 8 = 21

24. Did you get the correct answer? Why don’t we have the same answer to some items? What are the operations used in each item?

25. In series of operations, certain rules must be followed to arrive at one specific answer.

26. The MDAS rule must be followed correctly to get the right answer.

27. The MDAS stands for the four basic operations – Multiplication, Division, Addition and Subtraction.

28. Multiply or divide first in the order as they come from left to right. 1 Rule

29. Add or subtract in the order as they come from left to right. 2 Rule

30. Remember Do first all Multiplication or Division before you do Addition or Subtraction.

31. Let’s solve this expression. 35 – 6 x 3 35 – 18 17 18-12÷6+7 18-2+7 16+7 23

32. How do you perform series of operation? What is MDAS Rule?

33. Multiply or divide first in the order as they come from left to right. 1 Rule

34. Add or subtract in the order as they come from left to right. 2 Rule

35. Group Activity Group 1 : Evaluate the following expressions. 1. 12 ÷ 3 + 8 = N 2. 84 ÷ 3 x 4 = N 3. 76 – 8 + 5 = N 4. 9 x 9 ÷ 3 – 9 + 6 = N 5. 16 ÷ 4 X 5 – 7 + 8 = N

36. Group Activity Group 2 : Write the correct symbols in the box to make the expression right. 1.60 _____ 42 _____ 14 = 60 _____ 3 = 57 2. 16 _____ 8 ____ 4 = 16 _____ 2 = 8

37. Group Activity Group 3 : Use the digits 5, 6,7,and 8 to make the expression result to 39. _____ x _____ - _____ + _____ = 39

38. 1. 4 x 3 + 8 2. 84 ÷ 3 x 4 3. 76 – 8 + 5 4. 7 x 9 ÷ 3 – 7 + 8 5. 6 x 4 + 7 – 8 ÷ 2 Solve the expression:

39. That’s all for today kids. THANK YOU