Multiplying & dividing by 10, 100, 1000

Multiply and divide whole numbers and decimals by 10, 100 and 1000 by shifting the digits

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Try each question. If you're stuck, leave it and come back. The answer key is on the last page.

1
What is 34 × 10? A) 34 B) 340 C) 3400 D) 3.4
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2
Complete: 7 × 100 = ___ 7 × 100 = ___
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3
Is this statement true or false? 5000 ÷ 1000 = 5. A) True B) False
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4
What is 80 ÷ 10? A) 800 B) 80 C) 8 D) 0.8
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5
Complete: 3.4 × 100 = ___ 3.4 × 100 = ___
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6
What is 250 ÷ 100? A) 25 B) 2.5 C) 0.25 D) 2500
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7
Order these from smallest to largest: 4.2 × 10, 42 ÷ 10, 420 ÷ 100, 0.42 × 100. Put these in order: 4.2 × 10, 42 ÷ 10, 420 ÷ 100, 0.42 × 100
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8
Complete: 6.5 × 1000 = ___ 6.5 × 1000 = ___
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9
What is 27 ÷ 1000? A) 0.027 B) 0.27 C) 2.7 D) 27000
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10
Is this statement true or false? 0.08 × 1000 = 80. A) True B) False
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Answer key

Multiplying & dividing by 10, 100, 1000 · for parents and teachers

1
340
34 × 10 = 340. Each digit shifts one place left, so we add a 0.
2
700
7 × 100 = 700. Two place shifts add two zeros.
3
True
5000 ÷ 1000 = 5. The 5 in the thousands column moves to the ones column.
4
8
80 ÷ 10 = 8. The 8 in the tens column moves to the ones column.
5
340
3.4 × 100 = 340. The 3 moves to hundreds, the 4 moves to tens, and we add a 0 for the ones.
6
2.5
250 ÷ 100 = 2.5. The 2 moves to ones and the 5 moves to tenths.
7
42 ÷ 10, 420 ÷ 100, 0.42 × 100, 4.2 × 10
4.2 × 10 = 42, 42 ÷ 10 = 4.2, 420 ÷ 100 = 4.2, 0.42 × 100 = 42. The two 4.2 values come first, then the two 42 values.
8
6500
6.5 × 1000 = 6500. The 6 moves to thousands, the 5 moves to hundreds, and we add zeros for tens and ones.
9
0.027
27 ÷ 1000 = 0.027. The 2 moves to hundredths, the 7 moves to thousandths.
10
True
0.08 × 1000 = 80. The 8 in the hundredths column moves to the tens column.