Easy
8
−2
HALVE
+10
×7
−1
÷9
+2
÷3
+4
Medium
51
×2
−7
DOUBLE
+2
×5/8
HALVE
−4
×4/7
×3
Hard
76
÷4
+1
×32/5
×25%
+3
×13/5
×5
−16
√
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).