Let's solve each of the decimal subtraction problems on the worksheet step by step.
The worksheet contains 12 subtraction problems, all in the form:
9.9 − (a number)
We will subtract each number from 9.9 carefully, aligning the decimal points.
---
Problem 1:
9.9 − 2.1
```
9.9
− 2.1
-----
7.8
```
✔ Answer: 7.8
---
Problem 2:
9.9 − 3.2
```
9.9
− 3.2
-----
6.7
```
✔ Answer: 6.7
---
Problem 3:
9.9 − 2.3
```
9.9
− 2.3
-----
7.6
```
✔ Answer: 7.6
---
Problem 4:
9.9 − 4.1
```
9.9
− 4.1
-----
5.8
```
✔ Answer: 5.8
---
Problem 5:
9.9 − 5.1
```
9.9
− 5.1
-----
4.8
```
✔ Answer: 4.8
---
Problem 6:
9.9 − 6.1
```
9.9
− 6.1
-----
3.8
```
✔ Answer: 3.8
---
Problem 7:
9.9 − 7.1
```
9.9
− 7.1
-----
2.8
```
✔ Answer: 2.8
---
Problem 8:
9.9 − 2.2
```
9.9
− 2.2
-----
7.7
```
✔ Answer: 7.7
---
Problem 9:
9.9 − 3.3
```
9.9
− 3.3
-----
6.6
```
✔ Answer: 6.6
---
Problem 10:
9.9 − 4.4
```
9.9
− 4.4
-----
5.5
```
✔ Answer: 5.5
---
Problem 11:
9.9 − 5.5
```
9.9
− 5.5
-----
4.4
```
✔ Answer: 4.4
---
Problem 12:
9.9 − 6.6
```
9.9
− 6.6
-----
3.3
```
✔ Answer: 3.3
---
Problem 13:
9.9 − 7.7
```
9.9
− 7.7
-----
2.2
```
✔ Answer: 2.2
---
Problem 14:
9.9 − 8.8
```
9.9
− 8.8
-----
1.1
```
✔ Answer: 1.1
---
Problem 15:
9.9 − 5.3
```
9.9
− 5.3
-----
4.6
```
✔ Answer: 4.6
---
Final Answers:
| Problem | Answer |
|--------|--------|
| 9.9 − 2.1 |
7.8 |
| 9.9 − 3.2 |
6.7 |
| 9.9 − 2.3 |
7.6 |
| 9.9 − 4.1 |
5.8 |
| 9.9 − 5.1 |
4.8 |
| 9.9 − 6.1 |
3.8 |
| 9.9 − 7.1 |
2.8 |
| 9.9 − 2.2 |
7.7 |
| 9.9 − 3.3 |
6.6 |
| 9.9 − 4.4 |
5.5 |
| 9.9 − 5.5 |
4.4 |
| 9.9 − 6.6 |
3.3 |
| 9.9 − 7.7 |
2.2 |
| 9.9 − 8.8 |
1.1 |
| 9.9 − 5.3 |
4.6 |
---
Explanation:
All problems involve subtracting a decimal from 9.9. The key is to line up the decimal points and subtract digit by digit, borrowing when necessary. Since both numbers have one decimal place, we can treat them as tenths (e.g., 9.9 = 99/10), which makes subtraction straightforward.
For example:
9.9 − 2.1 = (99 − 21)/10 = 78/10 = 7.8
This method works for all the problems.
✔ You can now fill in the answers on the worksheet!
And choose the smiley face that matches how you did 😊😊😉
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Parent Tip: Review the logic above to help your child master the concept of decimal subtraction worksheet.
