5-2=?
2
3
1
4-1=?
3-0=?
0
4-2=
3+3= ?
5
6
6 - 1 =?
7
6 - 2 =?
4
6 - 0 =?
0 + 6 =?
4 + 2 =?
2 +3 + 1 =?
4 + 1 + 1 =?
2 + 2 + 2 =?