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A number line is not useful in multiplication. Instead, think of multiplying by 20 as first multiplying by 2 (a relatively easy process) and then multiplying by 10 (which is done easily by moving the decimal point one place to the right). For example, to multiply 45 by 20, first multiply 45 by 2, which is 90. Then multiply 90 by 10: move the decimal point one place to the right, making 900.

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