addition and subtraction > addition and subtraction > Flashcards
1+2
3
2+1
1+3
4
2+2
3+1
13-9
1+4
5
2+3
3+2
4+1
14-9
13-8
1+5
6
2+4
3+3
4+2
5+1
15-9
14-8
13-7
1+6
7
2+5
3+4
4+3