Missing Numbers in Equations (Blanks) -- Addition (Range 1 to 9) (A) - Free Printable

Educational worksheet: Missing Numbers in Equations (Blanks) -- Addition (Range 1 to 9) (A). Download and print for classroom or home learning activities.

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Show Answer Key & Explanations Step-by-step solution for: Missing Numbers in Equations (Blanks) -- Addition (Range 1 to 9) (A)

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Let's solve each equation by finding the missing number. The general rule is:

> If: A + ___ = B, then the missing number is: B - A

We'll go row by row and fill in the blanks.

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Row 1:

1. `__ + 1 = 4` → 4 - 1 = 3
2. `__ + 3 = 8` → 8 - 3 = 5
3. `3 + __ = 12` → 12 - 3 = 9
4. `8 + __ = 16` → 16 - 8 = 8

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Row 2:

5. `7 + __ = 16` → 16 - 7 = 9
6. `__ + 3 = 7` → 7 - 3 = 4
7. `1 + __ = 8` → 8 - 1 = 7
8. `__ + 1 = 9` → 9 - 1 = 8

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Row 3:

9. `2 + __ = 6` → 6 - 2 = 4
10. `__ + 8 = 15` → 15 - 8 = 7
11. `4 + __ = 5` → 5 - 4 = 1
12. `9 + __ = 15` → 15 - 9 = 6

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Row 4:

13. `__ + 8 = 9` → 9 - 8 = 1
14. `3 + __ = 8` → 8 - 3 = 5
15. `4 + __ = 5` → 5 - 4 = 1
16. `__ + 9 = 16` → 16 - 9 = 7

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Row 5:

17. `5 + __ = 6` → 6 - 5 = 1
18. `6 + __ = 14` → 14 - 6 = 8
19. `6 + __ = 13` → 13 - 6 = 7
20. `__ + 5 = 7` → 7 - 5 = 2

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Row 6:

21. `__ + 8 = 17` → 17 - 8 = 9
22. `__ + 7 = 15` → 15 - 7 = 8
23. `__ + 5 = 7` → 7 - 5 = 2
24. `4 + __ = 11` → 11 - 4 = 7

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Row 7:

25. `__ + 7 = 10` → 10 - 7 = 3
26. `__ + 1 = 9` → 9 - 1 = 8
27. `__ + 6 = 12` → 12 - 6 = 6
28. `__ + 2 = 9` → 9 - 2 = 7

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Row 8:

29. `3 + __ = 10` → 10 - 3 = 7
30. `__ + 8 = 10` → 10 - 8 = 2
31. `2 + __ = 9` → 9 - 2 = 7
32. `__ + 3 = 10` → 10 - 3 = 7

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Row 9:

33. `1 + __ = 10` → 10 - 1 = 9
34. `__ + 3 = 8` → 8 - 3 = 5
35. `__ + 6 = 11` → 11 - 6 = 5
36. `__ + 6 = 10` → 10 - 6 = 4

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Row 10:

37. `8 + __ = 15` → 15 - 8 = 7
38. `__ + 8 = 14` → 14 - 8 = 6
39. `8 + __ = 9` → 9 - 8 = 1
40. `__ + 7 = 15` → 15 - 7 = 8

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Final Answer (filled in):

```
3 + 1 = 4 5 + 3 = 8 3 + 9 = 12 8 + 8 = 16
7 + 9 = 16 4 + 3 = 7 1 + 7 = 8 8 + 1 = 9
2 + 4 = 6 7 + 8 = 15 4 + 1 = 5 9 + 6 = 15
1 + 8 = 9 3 + 5 = 8 4 + 1 = 5 7 + 9 = 16
5 + 1 = 6 6 + 8 = 14 6 + 7 = 13 2 + 5 = 7
9 + 8 = 17 8 + 7 = 15 2 + 5 = 7 4 + 7 = 11
3 + 7 = 10 8 + 1 = 9 6 + 6 = 12 7 + 2 = 9
3 + 7 = 10 2 + 8 = 10 2 + 7 = 9 7 + 3 = 10
1 + 9 = 10 5 + 3 = 8 5 + 6 = 11 4 + 6 = 10
8 + 7 = 15 6 + 8 = 14 8 + 1 = 9 8 + 7 = 15
```

✔ All equations are now correct!

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Summary:

To solve these problems, you simply subtract the known number from the total to find the missing addend.

For example:
If `x + 3 = 8`, then `x = 8 - 3 = 5`.

This method works for all addition equations of the form `A + x = B`.

Parent Tip: Review the logic above to help your child master the concept of addition worksheet fill.

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