Easy
19
−7
×4
−15
÷3
+13
HALVE
−3
SQUARE
−9
Medium
30
HALVE
−3
×1/4
SQUARE
−1
×3/4
×4
−11
×8
Hard
50
×80%
−4
÷9
SQUARE
÷8
+16
×5
×90%
−15
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).