Let's solve each problem step by step. The worksheet involves
adding and subtracting metric lengths, primarily in
centimeters (cm) and
millimeters (mm). Remember:
- 1 cm = 10 mm
- When adding or subtracting, ensure both measurements are in the same unit.
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Solutions:
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1) 3.8 cm + 1.9 cm
= 5.7 cm
✔
---
2) 3.6 cm + 2.7 cm
= 6.3 cm
✔
---
3) 3.2 cm + 2.9 cm
= 6.1 cm
✔
---
4) 3.1 cm + 1.5 cm
= 4.6 cm
✔
---
5) 4.2 cm + 1.6 cm
= 5.8 cm
✔
---
6) 4.3 cm - 2.4 cm
= 1.9 cm
✔
---
7) 4.3 cm - 2.7 cm
= 1.6 cm
✔
---
8) 3.3 cm - 1.5 cm
= 1.8 cm
✔
---
9) 5.4 cm - 3.7 cm
= 1.7 cm
✔
---
10) 4.4 cm - 2.8 cm
= 1.6 cm
✔
---
11) 3.6 cm - 1.7 cm
= 1.9 cm
✔
---
12) 4.5 cm + 37 mm
Convert 37 mm to cm:
37 mm = 3.7 cm
Now add: 4.5 cm + 3.7 cm =
8.2 cm ✔
---
13) 41 mm + 1.7 cm
Convert 41 mm to cm:
41 mm = 4.1 cm
Now add: 4.1 cm + 1.7 cm =
5.8 cm ✔
---
14) 43 mm + 3.6 cm
Convert 43 mm to cm:
43 mm = 4.3 cm
Add: 4.3 cm + 3.6 cm =
7.9 cm ✔
---
15) 4.6 cm + 29 mm
Convert 29 mm to cm:
29 mm = 2.9 cm
Add: 4.6 cm + 2.9 cm =
7.5 cm ✔
---
16) 26 mm + 1.9 cm
Convert 26 mm to cm:
26 mm = 2.6 cm
Add: 2.6 cm + 1.9 cm =
4.5 cm ✔
---
17) 37 mm + 1.9 cm
Convert 37 mm to cm:
37 mm = 3.7 cm
Add: 3.7 cm + 1.9 cm =
5.6 cm ✔
---
18) 2.4 cm - 15 mm
Convert 15 mm to cm:
15 mm = 1.5 cm
Subtract: 2.4 cm - 1.5 cm =
0.9 cm ✔
---
19) 45 mm - 3.9 cm
Convert 45 mm to cm:
45 mm = 4.5 cm
Subtract: 4.5 cm - 3.9 cm =
0.6 cm ✔
---
20) 54 mm - 2.5 cm
Convert 54 mm to cm:
54 mm = 5.4 cm
Subtract: 5.4 cm - 2.5 cm =
2.9 cm ✔
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✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 1 | 5.7 cm |
| 2 | 6.3 cm |
| 3 | 6.1 cm |
| 4 | 4.6 cm |
| 5 | 5.8 cm |
| 6 | 1.9 cm |
| 7 | 1.6 cm |
| 8 | 1.8 cm |
| 9 | 1.7 cm |
| 10 | 1.6 cm |
| 11 | 1.9 cm |
| 12 | 8.2 cm |
| 13 | 5.8 cm |
| 14 | 7.9 cm |
| 15 | 7.5 cm |
| 16 | 4.5 cm |
| 17 | 5.6 cm |
| 18 | 0.9 cm |
| 19 | 0.6 cm |
| 20 | 2.9 cm |
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📝 Explanation:
- For problems involving
different units (cm and mm), always convert one unit to match the other.
- Since 1 cm = 10 mm, divide mm by 10 to get cm (or multiply cm by 10 to get mm).
- Then perform addition or subtraction as normal decimals.
Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of adding and subtracting irregular units worksheet.
