addition
15 + 3 =
15 + 3 = 18
3 x 2 =
3 x 2 = 6
30 - 10 =
30 - 10 = 20
90 + 1 =
90 + 1 = 91
5 x 3 =
5 x 3 = 15
7 - 4 =
7 - 4 = 3
1 + 2 =
1 + 2 = 3
10 x 5 =
10 x 5 = 50
8 - 5 =
8 - 5 = 3
9 + 20 =
9 + 20 = 29
3 x 7 =
3 x 7 = 21
5 - 2 =
5 - 2 = 3
3 + 10 =
3 + 10 = 13
4 x 3 =
4 x 3 = 12
0 - 1 =
0 - 1 = 0