Easy
2
×3
−1
×9
−11
÷2
−7
SQUARE
HALVE
+19
Medium
25
×2
−1
×5/7
−9
×5
−8
HALVE
−18
×3
Hard
71
×2
+8
×3/5
HALVE
×31/3
÷3
+6
÷8
CUBE
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).