This document contains a math lesson on performing a series of operations using the order of operations (MDAS) correctly. It provides examples of applying multiplication and division first from left to right, then addition and subtraction in order from left to right. These include step-by-step workings for expressions like 3 x 6 ÷ 2, 10 - 6 + 4, and 18 ÷ 3 x 4 - 6 + 9. The document emphasizes that following the MDAS rule is important when solving expressions with multiple operations.

1. Rinadel P. Novida
Grade IV-Mathematics

2. “ Numero Uno ang
Batang TarlakHenyo,
Basta’t Mathalino,
Panalo!

3. Rinadel P. Novida
Grade IV-Mathematics

4. Performing a Series of Two or
More Operations Applying
Multiplication,
Division,Addition, Subtraction
(MDAS) correctly

5. Solving multi-step routine and
non-routine problems involving
division and any of the other
operations of whole numbers
including money using appropriate
problem-solving strategies and
tools.

6. Solve the given problem.
Choose the letter of the
correct answers.

7. Mercy had 450 boxes of pencils with 24
pencils in each box. She gave sixteen boxes of
pencils to his brother. How many pencils are
left to Mercy? If Mercy decided to donate the
remaining pencils to 6 grade school classes,
how many pencils will each class receive?
Read the problem.

8. 1. What is asked in the
problem?

9. a. the number of boxes of pencils
b. the number of pencils in each box
c. the number of pencils received by six
grade school classes
d. The number of pencils received by Mercy
3
2
1

10. 2.What are the
given facts?

11. a. 450 boxes of pencils with 24 pencils in
each box
b. 350 boxes of pencils with 20 pencils in
each box
c. 400 boxes of pencils with 25 pencils in
each box
d. 420 boxes of pencils with 22 pencils in each
box. 3
2
1

12. 3. What are the
operations to be
used in the given
problem?

13. a. multiplication and division
b. addition and multiplication
c. subtraction, multiplication and division
d. addition, multiplication and division
3
2
1

14. 4. What is the
number
sentence?

15. a. (450-16) x 24 ÷6=N
b. (450-16) +24 ÷6=N
c. (450 + 16) X 24 ÷ 6=N
d. (450 + 16) + 24 ÷6=N
3
2
1

16. 5. What is the final
answer?

17. a. 1 836
b. 1 963
c. 1 746
d. 1 736
Each class received
a total of 1 736
pencils.
3
2
1

18. Rinadel P. Novida
Grade IV-Mathematics

19. Miggy was absent for a week on his
online class because he was sick.
When he got back to his online class,
he had to take a test. Items for the test
are given below:

21. Do you think Miggy can answer the
test correctly? Why?
No. Miggy cannot answer all the
test correctly because he was absent
for a week.

22. If you were his classmate, what would
you do to help him?
What do you feel when you help
someone? Why?
What do you think will he do?

23. Rinadel P. Novida
Grade IV-Mathematics

24. Performing a Series of Two or
More Operations Applying
Multiplication, Division,
Addition, Subtraction (MDAS)
correctly

25. MDAS stands for the four basic
operations-
• Multiplication
• Division
• Addition
• Subtraction

26. Let’s have examples.
First, multiply or divide as
they come from left to right.

27. 3 x 6 + 18 = 36
1. 3 x 6 + 18
18 + 18
36

28. 19 – 12 ÷ 2 = 13
2. 19 - 12 ÷ 2
19 - 6
13

29. 6 x 5 – 15 ÷ 3 = 25
3. 6 x 5 - 15 ÷ 3
30 - 5
25

30. 32 + 12 x 5 = 92
4. 32 + 12 x 5
32 + 60
92

31. 11 x 6 ÷ 2 = 33
5. 11 x 6 ÷ 2
66 ÷ 2
33

32. 51 ÷ 17 x 14= 42
6. 51 ÷ 17 x 14
3 x 14
42

33. Second, add or subtract in
the order they appear from
left to right.

34. 7. 75 + 5 - 15
80 - 15
65
75 + 5 – 15 = 65

35. 8. 60 – 37 + 45
23 + 45
68
60 – 37 + 45 = 68

36. Rinadel P. Novida
Grade IV-Mathematics

37. Solve the following expression.
1. 3 x 6 ÷ 2
5
4
3
2
1

38. 3 x 6 ÷ 2 = 9
3 X 6 ÷ 2
18 ÷ 2
9

39. Solve the following expression
2. 10 – 6 + 4
5
4
3
2
1

40. 10 – 6 + 4
4 + 4
8
10 – 6 + 4 = 8

41. Solve the following expression
3. 72 ÷ 9 x 11
5
4
3
2
1

42. 72 ÷ 9 x 11 = 88
72 ÷ 9 x 11
8 x 11
88

43. Solve the following expression
4. 9 x 3 – 16 ÷ 4
5
4
3
2
1

44. 9 x 3 – 16 ÷ 4 = 23
9 x 3 – 16 ÷ 4
23
27 - 4

45. Solve the following expression
5. 25 x 6 – 13 x 4
5
4
3
2
1

46. 25 x 6 - 13 x 4 = 98
25 x 6 - 13 x 4
150 - 52
98

47. Solve the following expression
6. 18 ÷ 3 x 4 - 6 + 9
5
4
3
2
1

48. 18 ÷ 3 x 4 - 6 + 9 = 27
18 ÷ 3 x 4 - 6 + 9
6 x 4 - 6 + 9
18 + 9
24 - 6 + 9
27

49. Rinadel P. Novida
Grade IV-Mathematics

50. When performing a series of
operations, the MDAS rule must be
followed. The rule says that:
First, multiply or divide as they come
from left to right.
Then, add or subtract as they appear
from left to right.
Remember:

51. Rinadel P. Novida
Grade IV-Mathematics