Easy
9
−1
HALVE
+15
×3
+18
÷5
−7
SQUARE
−18
Medium
58
+5
×2/3
−6
×2/9
SQUARE
HALVE
−15
DOUBLE
−1
Hard
33
−9
÷12
CUBE
+4
×5
×25%
−5
SQUARE
HALVE
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).