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Imagine instead that your equation is (124/10) * (31/10), or, all things being commutative in multiplication, (124 * 31) * (1/10 * 1/10) = (124 * 31) * (1/100) = (124 * 31) / 100. Multiply the first term, and you get 3844. Once you divide from there, you get 38.44.

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11y ago
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Q: Why is 12.4 times 3.1 equal 38.44?
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