Question

which of the numbers 28 33 45 57 39 and 36 could be subtracted from 84 without regrouping? please explain

Answer 1

If i'm not mistaken it would be 33. 

 84
-33
------
51

Answer 2

28 can be subtracted from 84 with regrouping. I know this because you take the 3 from 33 and subtract it from the 4 from 84 and get 1. Then you get the other 3 from 33 and subtract it from 8 and get 5. So your final answer is 51.