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Explain why you would make one of the addenda a tens number when solving an addition problem
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Explain why you would make one of the addenda a tens number when solving an addition problem

User Munzilla
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For example if adding 9 + 9 you would take whatever needed from the second number to fill the first number (In this case being one, to have 10 + 8) and replace the 0 with the second number (In this case being 18) 
User Bram Vanroy
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