Easy
18
+17
÷7
+9
×2
+12
HALVE
−9
×3
−14
Medium
41
−1
÷5
−2
×1/2
SQUARE
×3
+1
×3/7
HALVE
Hard
16
−7
√
+21
×25%
CUBE
HALVE
×31/2
−6
÷12
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).