addition with regrouping

Front

321 + 145 =

Back

466

Front

345 + 129 =

Back

474

Front

33 birds + 18 more birds fly over

Back

51

Front

If there are 12 bags of Skittles and you buy 9 more, how many bags are there now?

Back

21

Front

524 + 191 =

Back

715

Front

531 + 273 =

Back

804

Front

Fifteen dogs were in the girl's house, then 12 cats came. How many cats and dogs were at the house now?

Back

27

Front

27+56=

Back

83

Front

35+48=

Back

83

Front

34 + 23

Back

57