Easy
2
+7
×5
−15
HALVE
−3
÷6
+3
×6
+16
Medium
47
−3
×1/2
−6
×3/8
−1
×2
SQUARE
−2
÷7
Hard
110
+2
÷14
×25%
+3
×43/5
−3
÷4
CUBE
−7
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).