Easy
13
−5
SQUARE
−1
÷7
+5
HALVE
+11
×5
−7
Medium
31
DOUBLE
−2
÷4
−8
SQUARE
−1
×1/3
−4
÷6
Hard
63
+1
÷4
−1
×41/3
−19
HALVE
+17
×80%
×3
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).