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25 * 1.7 * 4 = 25 * 4 * 1.7 [multiplication is commutative] = (25*4) * 1.7 [multiplication is associative] = 100 * 1.7 = 10 * 17 [multiplication of a decimal fraction by 10 is equivalent to moving the decimal poin one place to the right] = 170 [multiplying an integer by 10 is equivalent to adding a zero to its right]

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Q: What is 25 times 1.7 times 4 justify each step?
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