6+4
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10+6
6+6 7+7 10+8 6+4
You need to regroup when you have something like 46-39. You would cross out the 6 and make it a 16, because you are taking ten from the 4, then you cross out the 4 then make it a three, then you should get 7.
when you add a number from 3 to 9
When the two numbers have an answer that is greater than or equal to ten.