Easy
8
−2
SQUARE
−10
HALVE
+17
÷2
−8
×7
+16
Medium
47
−15
×1/2
×9
−3
DOUBLE
+5
÷7
−18
×2
Hard
63
−17
HALVE
+10
÷11
+3
×2/3
CUBE
−1
×5/7
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).