Clint Proctor is a lead editor with the credit cards and travel rewards team at Forbes Advisor. He has five years of experience in personal finance journalism and has contributed to a variety of ...

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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 ...