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4 over 10 (multiply by 2), 8 over 20 (multiply by 4), 12 over 30 (multiply by 6)

Simply multiply the numerator (the top digit in the problem) and the denominator (the bottom digit inthe problem) by the same number. This finds multiples of both numbers that are in the same proportion to each other as the original problem.

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13y ago

What else can I help you with?