To help your child learn how to make one addend the next tens numbers, break down each number into tens and ones. 56 can be divided into tens or ones and then added to 50 to get a total of seventy six. Similar to 61, it can be broken down into two equal triangulars: fifty plus six to get seventy-six, and twenty plus six for eighty-one. Once you understand the underlying idea, you can apply it to the problem.
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