Seudónimo Seudónimo

24-03-2016
Mathematics

contestada

instead of dividing 220 x 5 double both numbers and mentally calculate the quotient

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MichaelLiu MichaelLiu

24-03-2016

220 * 5 = 220 * 2/2 * 5 * 2/2 = 440 * 10 / 4 = 110 * 10 = 1100

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