Easy
10
SQUARE
HALVE
+10
÷3
−1
×5
+1
÷6
−10
Medium
56
×2
−19
×1/3
−7
÷8
SQUARE
−1
×1/2
×4
Hard
25
−1
×31/3
×2
−7
×5/9
+5
÷6
+1
÷4
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).