If you have to have at least one group of each, there are four.
25
8 tens.
4/-3 8
With addition, you need to regroup in the event that there are more than 10 ones or 10 tens. In a subtraction, you must regroup whenever there are insufficient ones or tens to subtract.
1 tens and 2 0nes
500+10+6 = 516
(3*10)+(9*1)=39
78 can be regrouped into 6 tens and 18 ones.
8 tens and 4 one
To take the tens place and add it to the other tens
To regroup 4 tens in 341, change it to 3 hundreds and 14 tens. Then, subtract 2 hundreds and 2 tens from 3 hundreds and 14 tens to get the difference. The difference between 341 and 228 is 113.
8 tens 2 ones