Easy
17
−10
×6
+2
÷4
+7
HALVE
−1
SQUARE
+16
Medium
21
DOUBLE
×1/3
−8
HALVE
SQUARE
×6
−5
×5/7
−14
Hard
108
−8
÷10
+9
SQUARE
+3
×6/13
−12
÷13
×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).