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I think you mean you want to pull the common factor(s) of 10 and 40 outside the expression 10 + 40. Since 40 is divisible by 10, 10 is clearly the gcf. So 10 + 40 = 10 * 1 + 10 * 4 =10 * (1 + 4).

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13y ago

What else can I help you with?