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!
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6+6 7+7 10+8 6+4
10+6
1 ten and 11 ones is 1 × 10 + 11 × 1 = 10 + 11 = 21.
10
Nine tens = 90 Ten ones = 10 90 + 10 = 100