How to multiply and divide by 0, 1, 10 and 100

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Watch: How to multiply and divide 0, 1,10 and 100

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Multiplying by 1, 10, or 100

21 × 10 multiplication written on paper
21 × 10 = 210

When you multiply by 1 the answer stays the same.

21 × 1 = 21

When you multiply by 10, move all the digits one place to the left, putting a zero in the empty space.

21 × 10 = 210

When you multiply by 100, move all the digits two places to the left, putting a zero in the empty spaces.

21 × 100 = 2100

21 × 10 multiplication written on paper
21 × 10 = 210
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Multiplying by 0

A rectangle character looking confused at the sum 9456 x 0 = 0

Any number multiplied by 0 is 0

5 × 0 = 0

100 × 0 = 0

9456 × 0 = 0

What is 1,000,000 × 0?

A rectangle character looking confused at the sum 9456 x 0 = 0
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Dividing by 1, 10 or 100

210 divided by 10 written on grid paper.
210 ÷ 10 = 21

When you divide by 1 the answer stays the same.

21 ÷ 1 = 21

When you divide by 10, move all the digits one place to the right.

210 ÷ 10 = 21

When you divide by 100, move all the digits two places to the right.

2100 ÷ 100 = 21

210 divided by 10 written on grid paper.
210 ÷ 10 = 21
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Activities

Activity 1

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Activity 2

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Quiz

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In this game, use the times tables and more maths skills to defeat monsters and reclaim the Kingdom.

Play Guardians: Defenders of Mathematica to get ready for SATs.
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