18 + 9 =
18 - 9 =
16 + 8 =
19 - ___ = 9
19 + 9 =
15 + __ = 26
16 - 9 =
17 + 8 =
16 + __ = 24
15 + 23 =
9
11
28
25
27
38
10
7
8
24
