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To calculate 5 x 21 using place value, we can break down 21 into its place values, which are 20 and 1. First, we multiply 5 by 20, which equals 100. Then, we multiply 5 by 1, which equals 5. Finally, we add these two results together: 100 + 5 = 105, so 5 x 21 equals 105.

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2w ago

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