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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

Any number multiplied by 0 is 0

5 × 0 = 0

100 × 0 = 0

9456 × 0 = 0

What is 1,000,000 × 0?

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