when you add a number from 3 to 9
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When the two numbers have an answer that is greater than or equal to ten.
Oh, dude, it's like super easy. So, you start with 78, right? And then you regroup 1 ten as 10 ones. So, you take 1 from the tens place and add it to the ones place, making it 8 tens and 18 ones. See, easy peasy lemon squeezy!
6+6 7+7 10+8 6+4
6+4
one ten and two ones.