Finding the missing numbers in a sequence or a series is a fun activity for the students to identify the patterns and memorize multiplication tables, numbers, fundamental mathematical operations, or even counting. This activity helps to develop the mental skills of the student. We can find missing numbers using the pictorial representations, in a series, in a table format or simply using blanks. To find the missing numbers, we need to observe the pattern given and then fill in the blank. In this article, we will discuss different activities to find the missing numbers and observe the patterns and calculations. We shall do the activity with the use of series, tables, and pictorial representations for a better understanding of the concept. We shall find missing numbers in addition, subtraction, multiplication, and division to understand these arithmetic operations better.

1. MAth Class
Grade-4
Teacher Emmanuel D. Sano

2. PRAyer

3. Attendanc
e

4. Good
morning

5. Review

6. Completin
g Patterns

7. 1
what are the
missing
numbers?
7
4 10 13

8. 6
what are the
missing
numbers?
8 10 12 14

9. 6 1
2
what are the
missing
numbers?
18 24 30 36

10. 1
5
20
what are the
missing
numbers?
30
25 35

11. 2
6
2
9
what are the
missing
numbers?
3
2
35 38

12. Number Puzzle!

15. Let’s Check!

16. Activity: Partners in Math
Direction: Work with a
partner. Please make your
number sentence with one
number missing, and ask
your partner to solve it.

17. Finding The
MIssing Number

18. Finding The MIssing Number
Note: “To find the missing number, use the opposite (inverse)
operation!”
Operation Symbol Example Inverse
Operation
Inverse
Symbol
Inverse
Example
Addition + 6 + 4 = 10 Subtraction − 10 − 4 = 6
Subtraction − 10 − 6 = 4 Addition + 4 + 6 = 10

19. Activity: Let’s Try This!
Direction: Find the Missing Numbers
1.) ___+ 14 = 30
2.) ___ - 24 = 44
3.) ___ - 17 = 23
4.) 11 + ___ = 30
5.) 23 + ___ = 46

20. Finding The
MIssing Number
involving Word
problem

21. There are 28 children
at the party. Twelve
children ate cake. The
rest ate ice cream.
How many children

22. What is asked?
What are given?
What is the number
sentence?

23. We can solve this problem using
this equation:
12 + N = 28
Then, we use the opposite or
inverse operation.
Note: The inverse of Addition is
Subtraction.
So, rewrite the equation in this

24. Activity: Group
Investigation

25. Apples in the Basket:
• Maria has 8 apples. She
wants to buy more
apples to have a total of
15. How many more
apples does she need?

26. Toy Cars Collection:
• Juan has a collection of
toy cars. He knows he
has 12 cars in total. If he
has 5 red cars, how
many blue cars does he
have?

27. Application on
Real life

28. 1. Shopping and Budgeting
Scenario:
You have ₱200. After buying a toy, you
have ₱75 left.
Question:
How much did the toy cost?
Math Sentence:
₱200 ___ = ₱75 Use inverse: ₱200
− → −
₱75 = ₱125

29. 2. Cooking and Recipes
Scenario:
A recipe needs 10 cups of flour. You've
already added 6 cups.
Question:
How many more cups do you need?
Math Sentence:
6 + ___ = 10 Use inverse: 10 6 = 4
→ −
Answer: You need 4 more cups.

30. Generalization

31. What do we do when
we have a missing
number?

32. Solve on Your Own
1.) + 25 = 50
2.) - 4 = 24
3.) - 18 = 23
4.) 41 + = 80
5.) 32 + = 56

33. Let’s Check!
1.) 25 + 25 = 50
2.) 28 - 4 = 24
3.) 41 - 18 = 23
4.) 41 + 39 = 80
5.) 32 + 24 = 56

34. Assignment:
Answer More Practice -
Activity A (Page 242)

35. Thank You!