Let's solve each of these missing number problems using the
inverse operation method, as suggested in the worksheet.
We'll go through each row and column step by step.
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Column 1:
1.
6 + ___ = 7
→ Inverse: 7 - 6 =
1
✔ Answer:
1
2.
9 - ___ = 5
→ Inverse: 9 - 5 =
4
✔ Answer:
4
3.
10 × ___ = 20
→ Inverse: 20 ÷ 10 =
2
✔ Answer:
2
4.
50 ÷ ___ = 10
→ Inverse: 50 ÷ 10 =
5
✔ Answer:
5
5.
12 + ___ = 14
→ Inverse: 14 - 12 =
2
✔ Answer:
2
6.
7 - ___ = 1
→ Inverse: 7 - 1 =
6
✔ Answer:
6
7.
5 × ___ = 10
→ Inverse: 10 ÷ 5 =
2
✔ Answer:
2
8.
14 ÷ ___ = 7
→ Inverse: 14 ÷ 7 =
2
✔ Answer:
2
9.
3 × ___ = 12
→ Inverse: 12 ÷ 3 =
4
✔ Answer:
4
---
Column 2:
1.
4 × ___ = 20
→ 20 ÷ 4 =
5
✔ Answer:
5
2.
15 ÷ ___ = 5
→ 15 ÷ 5 =
3
✔ Answer:
3
3.
18 + ___ = 20
→ 20 - 18 =
2
✔ Answer:
2
4.
16 - ___ = 10
→ 16 - 10 =
6
✔ Answer:
6
5.
20 × ___ = 40
→ 40 ÷ 20 =
2
✔ Answer:
2
6.
60 ÷ ___ = 10
→ 60 ÷ 10 =
6
✔ Answer:
6
7.
2 × ___ = 8
→ 8 ÷ 2 =
4
✔ Answer:
4
8.
7 × ___ = 70
→ 70 ÷ 7 =
10
✔ Answer:
10
9.
25 ÷ ___ = 5
→ 25 ÷ 5 =
5
✔ Answer:
5
---
Column 3:
1.
26 + ___ = 30
→ 30 - 26 =
4
✔ Answer:
4
2.
3 × ___ = 9
→ 9 ÷ 3 =
3
✔ Answer:
3
3.
9 ÷ ___ = 3
→ 9 ÷ 3 =
3
✔ Answer:
3
4.
13 - ___ = 8
→ 13 - 8 =
5
✔ Answer:
5
5.
17 - ___ = 12
→ 17 - 12 =
5
✔ Answer:
5
6.
8 × ___ = 16
→ 16 ÷ 8 =
2
✔ Answer:
2
7.
1 × ___ = 5
→ 5 ÷ 1 =
5
✔ Answer:
5
8.
5 × ___ = 40
→ 40 ÷ 5 =
8
✔ Answer:
8
9.
6 × ___ = 18
→ 18 ÷ 6 =
3
✔ Answer:
3
---
Column 4:
1.
10 ÷ ___ = 1
→ 10 ÷ 1 =
10
✔ Answer:
10
2.
20 - ___ = 15
→ 20 - 15 =
5
✔ Answer:
5
3.
70 ÷ ___ = 10
→ 70 ÷ 10 =
7
✔ Answer:
7
4.
8 ÷ ___ = 2
→ 8 ÷ 2 =
4
✔ Answer:
4
5.
5 × ___ = 20
→ 20 ÷ 5 =
4
✔ Answer:
4
6.
12 ÷ ___ = 4
→ 12 ÷ 4 =
3
✔ Answer:
3
7.
9 + ___ = 17
→ 17 - 9 =
8
✔ Answer:
8
8.
8 - ___ = 8
→ 8 - 8 =
0
✔ Answer:
0
9.
100 ÷ ___ = 10
→ 100 ÷ 10 =
10
✔ Answer:
10
---
✔ Final Answers (in order):
| Row | Col 1 | Col 2 | Col 3 | Col 4 |
|-----|-------|-------|-------|-------|
| 1 | 1 | 5 | 4 | 10 |
| 2 | 4 | 3 | 3 | 5 |
| 3 | 2 | 2 | 3 | 7 |
| 4 | 5 | 6 | 5 | 4 |
| 5 | 2 | 2 | 5 | 4 |
| 6 | 6 | 6 | 2 | 3 |
| 7 | 2 | 4 | 5 | 8 |
| 8 | 2 | 10 | 8 | 0 |
| 9 | 4 | 5 | 3 | 10 |
---
✔ Total Correct: 36 out of 36
All answers are correct!
---
🔍 Explanation:
The key idea here is using
inverse operations:
- For
addition, use
subtraction.
- For
subtraction, use
addition.
- For
multiplication, use
division.
- For
division, use
multiplication.
For example:
- If `6 + ? = 7`, then `? = 7 - 6 = 1`
- If `15 ÷ ? = 5`, then `? = 15 ÷ 5 = 3`
This method helps find the missing number efficiently.
✔ Final Answer: All 36 problems solved correctly!
Parent Tip: Review the logic above to help your child master the concept of operation worksheet.
