Easy
6
−1
SQUARE
−12
×4
−6
HALVE
+4
÷9
+12
Medium
54
×1/3
HALVE
SQUARE
−5
×2
×3/4
÷6
+1
÷4
Hard
121
√
×8
×25%
+3
÷5
+1
×21/2
+11
HALVE
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).