25
8 tens.
4/-3 8
1 tens and 2 0nes
500+10+6 = 516
(3*10)+(9*1)=39
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!
8 tens and 4 one
If you have to have at least one group of each, there are four.
To take the tens place and add it to the other tens
44
30+14=44