Easy
15
−1
×4
+7
÷3
−6
×5
−13
HALVE
−10
Medium
10
SQUARE
−11
DOUBLE
+6
×3/4
÷6
+4
×2/9
−1
Hard
96
HALVE
−4
×25%
SQUARE
−1
×3/8
+3
÷4
+19
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).