Easy
18
−7
×5
+17
HALVE
+19
÷5
−2
×3
+16
Medium
20
×3
×1/2
×4
−8
DOUBLE
−10
HALVE
+5
÷7
Hard
59
+7
×4/11
÷8
SQUARE
−3
×11/3
HALVE
CUBE
×25%
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).