Easy
14
+1
×5
+3
HALVE
−3
÷6
−1
SQUARE
−2
Medium
38
+2
÷5
SQUARE
−4
×1/5
DOUBLE
+1
×2/5
×8
Hard
57
+31
×25%
−4
×2/3
×9
−12
HALVE
+16
×2
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).