Let’s solve each conversion step by step.
We know:
- 1 cm = 10 mm
- So, to convert
cm to mm, multiply by 10.
- To convert
mm to cm, divide by 10 (or move decimal one place left).
---
1a. 9.4 cm = ? mm
→ 9.4 × 10 =
94 mm
1b. 2.1 cm = ? mm
→ 2.1 × 10 =
21 mm
---
2a. 1.2 cm = ? mm
→ 1.2 × 10 =
12 mm
2b. 714 mm = ? cm
→ 714 ÷ 10 =
71.4 cm
---
3a. 22.9 cm = ? mm
→ 22.9 × 10 =
229 mm
3b. 278 mm = ? cm
→ 278 ÷ 10 =
27.8 cm
---
4a. 4.5 cm = ? mm
→ 4.5 × 10 =
45 mm
4b. 49 mm = ? cm
→ 49 ÷ 10 =
4.9 cm
---
5a. 0.1 cm = ? mm
→ 0.1 × 10 =
1 mm
5b. 0.2 cm = ? mm
→ 0.2 × 10 =
2 mm
---
6a. 648 mm = ? cm
→ 648 ÷ 10 =
64.8 cm
6b. 0.5 cm = ? mm
→ 0.5 × 10 =
5 mm
---
7a. 37 mm = ? cm
→ 37 ÷ 10 =
3.7 cm
7b. 7 mm = ? cm
→ 7 ÷ 10 =
0.7 cm
---
8a. 42.5 cm = ? mm
→ 42.5 × 10 =
425 mm
8b. 743 mm = ? cm
→ 743 ÷ 10 =
74.3 cm
---
9a. 26 mm = ? cm
→ 26 ÷ 10 =
2.6 cm
9b. 0.3 cm = ? mm
→ 0.3 × 10 =
3 mm
---
10a. 18 mm = ? cm
→ 18 ÷ 10 =
1.8 cm
10b. 35 mm = ? cm
→ 35 ÷ 10 =
3.5 cm
---
Final Answer:
1a. 94 mm
1b. 21 mm
2a. 12 mm
2b. 71.4 cm
3a. 229 mm
3b. 27.8 cm
4a. 45 mm
4b. 4.9 cm
5a. 1 mm
5b. 2 mm
6a. 64.8 cm
6b. 5 mm
7a. 3.7 cm
7b. 0.7 cm
8a. 425 mm
8b. 74.3 cm
9a. 2.6 cm
9b. 3 mm
10a. 1.8 cm
10b. 3.5 cm
Parent Tip: Review the logic above to help your child master the concept of metric unit for 4th grade math worksheet.
