Addition
4 + 0 = 1
4 + 0 = 2
4 + 0 = 3
4 + 0 = 4
7 + 0 =
0 + 9 =
4 + 2
Add
1 + 3 = ____
3 + 6
5 + 2
3 + 4
2 + 3