Multiplying decimals by 10 and 100 worksheet with 12 problems and a space for answers.
Worksheet titled "Multiplying Decimals by 10 and 100 Sheet 1A (1 to 100)" with math problems involving decimal multiplication and comparison exercises.
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Step-by-step solution for: Multiplying Decimals by 10 100 Worksheets
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Show Answer Key & Explanations
Step-by-step solution for: Multiplying Decimals by 10 100 Worksheets
Let’s go through each section of the worksheet step by step. We’ll solve every problem carefully and check our work as we go.
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Section A: Multiply these numbers by 10
When you multiply a decimal number by 10, you move the decimal point one place to the right.
1) 0.7 × 10 = 7.0 → just write 7
2) 5.9 × 10 = 59.0 → just write 59
3) 12.5 × 10 = 125.0 → just write 125
4) 2.4 × 10 = 24.0 → just write 24
5) 3.8 × 10 = 38.0 → just write 38
6) 14.1 × 10 = 141.0 → just write 141
7) 14.3 × 10 = 143.0 → just write 143
8) 16.2 × 10 = 162.0 → just write 162
9) 10 × 10 = 100
10) 0.9 × 10 = 9.0 → just write 9
11) 0.6 × 10 = 6.0 → just write 6
12) 14.3 × 10 = 143.0 → just write 143
✔ All correct!
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Section B: Multiply these numbers by 100
When you multiply by 100, move the decimal point two places to the right. Add zeros if needed.
1) 1.4 × 100 = 140
2) 10.0 × 100 = 1000
3) 100 × 100 = 10,000
4) 7.6 × 100 = 760
5) 25.6 × 100 = 2560
6) 500 × 100 = 50,000
7) 100 × 100 = 10,000
8) 14.3 × 100 = 1430
9) 200 × 100 = 20,000
10) 14.3 × 100 = 1430
11) 14.3 × 100 = 1430
12) 20.5 × 100 = 2050
✔ All correct!
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Section C: Circle the correct answer (bigger than or less than)
We compare the result after multiplying by 10 or 100 with the given number.
1) 14.3 × 10 = 143 → Is 143 bigger than 3.8? YES → circle “bigger than 3.8”
2) 75.6 × 10 = 756 → Is 756 bigger than 7.6? YES → circle “bigger than 7.6”
3) 70.6 × 10 = 706 → Is 706 bigger than 0.6? YES → circle “bigger than 0.6”
4) 82.0 × 10 = 820 → Is 820 bigger than 8.2? YES → circle “bigger than 8.2”
5) 87.9 × 10 = 879 → Is 879 bigger than 8.7? YES → circle “bigger than 8.7”
6) 177.6 × 10 = 1776 → Is 1776 bigger than 17.8? YES → circle “bigger than 17.8”
7) 178.5 × 10 = 1785 → Is 1785 bigger than 17.8? YES → circle “bigger than 17.8”
8) 177.6 × 10 = 1776 → Is 1776 bigger than 17.7? YES → circle “bigger than 17.7”
Wait — let’s double-check question 8:
It says “177.6 x 10” → that’s 1776. Compare to 17.7 → yes, 1776 is much bigger. So “bigger than 17.7” is correct.
But looking back at the original image, for #8 it says “177.6 x 10” and options are “bigger than 17.7” or “less than 17.7”. Since 1776 > 17.7, we pick “bigger than 17.7”.
Actually, in the user’s image, for #8 it might be miswritten — but based on what’s shown, we follow the math.
All answers here should be “bigger than” because multiplying by 10 makes the number much larger than the small decimals listed.
✔ All correct as per calculation.
---
Section D: Multiply these numbers by 20 or 200
This is trickier. Remember:
- Multiplying by 20 = multiply by 2, then by 10 (or shift decimal once after doubling)
- Multiplying by 200 = multiply by 2, then by 100 (shift decimal twice after doubling)
Let’s do them one by one:
1) 2.5 × 20
→ 2.5 × 2 = 5.0 → then ×10 = 50
2) 10 × 20 = 200
3) 4.5 × 20
→ 4.5 × 2 = 9.0 → ×10 = 90
4) 3.2 × 20
→ 3.2 × 2 = 6.4 → ×10 = 64
5) 22 × 20 = 440
6) 32.5 × 20
→ 32.5 × 2 = 65.0 → ×10 = 650
7) 38 × 20 = 760
8) 38 × 200
→ 38 × 2 = 76 → ×100 = 7600
9) 37 × 200
→ 37 × 2 = 74 → ×100 = 7400
10) 11.3 × 200
→ 11.3 × 2 = 22.6 → ×100 = 2260
11) 12.3 × 200
→ 12.3 × 2 = 24.6 → ×100 = 2460
12) 32.5 × 200
→ 32.5 × 2 = 65.0 → ×100 = 6500
Let me verify a couple:
Check #10: 11.3 × 200
= 11.3 × 2 × 100 = 22.6 × 100 = 2260 ✔
Check #12: 32.5 × 200
= 32.5 × 2 = 65 → 65 × 100 = 6500 ✔
All good!
---
Final Answer:
A)
1) 7
2) 59
3) 125
4) 24
5) 38
6) 141
7) 143
8) 162
9) 100
10) 9
11) 6
12) 143
B)
1) 140
2) 1000
3) 10000
4) 760
5) 2560
6) 50000
7) 10000
8) 1430
9) 20000
10) 1430
11) 1430
12) 2050
C)
1) bigger than 3.8
2) bigger than 7.6
3) bigger than 0.6
4) bigger than 8.2
5) bigger than 8.7
6) bigger than 17.8
7) bigger than 17.8
8) bigger than 17.7
D)
1) 50
2) 200
3) 90
4) 64
5) 440
6) 650
7) 760
8) 7600
9) 7400
10) 2260
11) 2460
12) 6500
---
Section A: Multiply these numbers by 10
When you multiply a decimal number by 10, you move the decimal point one place to the right.
1) 0.7 × 10 = 7.0 → just write 7
2) 5.9 × 10 = 59.0 → just write 59
3) 12.5 × 10 = 125.0 → just write 125
4) 2.4 × 10 = 24.0 → just write 24
5) 3.8 × 10 = 38.0 → just write 38
6) 14.1 × 10 = 141.0 → just write 141
7) 14.3 × 10 = 143.0 → just write 143
8) 16.2 × 10 = 162.0 → just write 162
9) 10 × 10 = 100
10) 0.9 × 10 = 9.0 → just write 9
11) 0.6 × 10 = 6.0 → just write 6
12) 14.3 × 10 = 143.0 → just write 143
✔ All correct!
---
Section B: Multiply these numbers by 100
When you multiply by 100, move the decimal point two places to the right. Add zeros if needed.
1) 1.4 × 100 = 140
2) 10.0 × 100 = 1000
3) 100 × 100 = 10,000
4) 7.6 × 100 = 760
5) 25.6 × 100 = 2560
6) 500 × 100 = 50,000
7) 100 × 100 = 10,000
8) 14.3 × 100 = 1430
9) 200 × 100 = 20,000
10) 14.3 × 100 = 1430
11) 14.3 × 100 = 1430
12) 20.5 × 100 = 2050
✔ All correct!
---
Section C: Circle the correct answer (bigger than or less than)
We compare the result after multiplying by 10 or 100 with the given number.
1) 14.3 × 10 = 143 → Is 143 bigger than 3.8? YES → circle “bigger than 3.8”
2) 75.6 × 10 = 756 → Is 756 bigger than 7.6? YES → circle “bigger than 7.6”
3) 70.6 × 10 = 706 → Is 706 bigger than 0.6? YES → circle “bigger than 0.6”
4) 82.0 × 10 = 820 → Is 820 bigger than 8.2? YES → circle “bigger than 8.2”
5) 87.9 × 10 = 879 → Is 879 bigger than 8.7? YES → circle “bigger than 8.7”
6) 177.6 × 10 = 1776 → Is 1776 bigger than 17.8? YES → circle “bigger than 17.8”
7) 178.5 × 10 = 1785 → Is 1785 bigger than 17.8? YES → circle “bigger than 17.8”
8) 177.6 × 10 = 1776 → Is 1776 bigger than 17.7? YES → circle “bigger than 17.7”
Wait — let’s double-check question 8:
It says “177.6 x 10” → that’s 1776. Compare to 17.7 → yes, 1776 is much bigger. So “bigger than 17.7” is correct.
But looking back at the original image, for #8 it says “177.6 x 10” and options are “bigger than 17.7” or “less than 17.7”. Since 1776 > 17.7, we pick “bigger than 17.7”.
Actually, in the user’s image, for #8 it might be miswritten — but based on what’s shown, we follow the math.
All answers here should be “bigger than” because multiplying by 10 makes the number much larger than the small decimals listed.
✔ All correct as per calculation.
---
Section D: Multiply these numbers by 20 or 200
This is trickier. Remember:
- Multiplying by 20 = multiply by 2, then by 10 (or shift decimal once after doubling)
- Multiplying by 200 = multiply by 2, then by 100 (shift decimal twice after doubling)
Let’s do them one by one:
1) 2.5 × 20
→ 2.5 × 2 = 5.0 → then ×10 = 50
2) 10 × 20 = 200
3) 4.5 × 20
→ 4.5 × 2 = 9.0 → ×10 = 90
4) 3.2 × 20
→ 3.2 × 2 = 6.4 → ×10 = 64
5) 22 × 20 = 440
6) 32.5 × 20
→ 32.5 × 2 = 65.0 → ×10 = 650
7) 38 × 20 = 760
8) 38 × 200
→ 38 × 2 = 76 → ×100 = 7600
9) 37 × 200
→ 37 × 2 = 74 → ×100 = 7400
10) 11.3 × 200
→ 11.3 × 2 = 22.6 → ×100 = 2260
11) 12.3 × 200
→ 12.3 × 2 = 24.6 → ×100 = 2460
12) 32.5 × 200
→ 32.5 × 2 = 65.0 → ×100 = 6500
Let me verify a couple:
Check #10: 11.3 × 200
= 11.3 × 2 × 100 = 22.6 × 100 = 2260 ✔
Check #12: 32.5 × 200
= 32.5 × 2 = 65 → 65 × 100 = 6500 ✔
All good!
---
Final Answer:
A)
1) 7
2) 59
3) 125
4) 24
5) 38
6) 141
7) 143
8) 162
9) 100
10) 9
11) 6
12) 143
B)
1) 140
2) 1000
3) 10000
4) 760
5) 2560
6) 50000
7) 10000
8) 1430
9) 20000
10) 1430
11) 1430
12) 2050
C)
1) bigger than 3.8
2) bigger than 7.6
3) bigger than 0.6
4) bigger than 8.2
5) bigger than 8.7
6) bigger than 17.8
7) bigger than 17.8
8) bigger than 17.7
D)
1) 50
2) 200
3) 90
4) 64
5) 440
6) 650
7) 760
8) 7600
9) 7400
10) 2260
11) 2460
12) 6500
Parent Tip: Review the logic above to help your child master the concept of multiplying decimals by 10 100 and 1000 worksheet.
