Key Idea1 of 3
When Ones Go Past 9
Sometimes the ones add up to 10 or more. 37 + 45: ones are 7 + 5 = 12. That is more than 9! We regroup: keep the 2 in the ones place and carry the 1 to the tens.
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Math — Addition and Subtraction to 100
Sometimes the ones add up to 10 or more. 37 + 45: ones are 7 + 5 = 12. That is more than 9! We regroup: keep the 2 in the ones place and carry the 1 to the tens.