Seudónimo Seudónimo

10-11-2016
Mathematics

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break apart the addends to find the sum 18+21

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Аноним Аноним

10-11-2016

break 18 into 10 and 8 and 21 to 20 and 1 then add 10 + 20 = 30 and 8 + 1 = 9 lastly 30 plus 9 = 39

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