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Break apart the addends to find the sum 18+21

Break apart the addends to find the sum 18+21
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Break apart the addends to find the sum 18+21

User Mikabytes
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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
User Amit Chaurasia
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