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.
No.
Yes.
yes
25
Yes, you do 73 -35 ___ 38
No
how
18
you need to regroup when the bottom number is bigger than the top number
8 tens.
108