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What is 428 x 27 need help

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428 * 27 = (400 + 28) * 27 = \\


400 * 27 + 28 * 27 =


10800 + (27 + 1)(27) =


10800 + 27 * 27 + 27 * 1 =


10800 + 729 + 27 = 11556

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