30 - 5 =
25
15 + 15 =
30
12 - 6 =
6
0 + 0 =
0
90 - 80 =
10
50 + 10 + 2 =
62
100 - 10 =
90
80 - 79 =
1
30+10 =
40
40 - 10 =
30
20 + 5 =
25
0 - 0 =
0
50 - 5 =
45
100 - 50 =
50
60 - 20 =
40
18 - 9 =
9