Easy
18
+17
÷7
SQUARE
+2
÷3
−1
×7
−10
HALVE
Medium
14
HALVE
SQUARE
−10
DOUBLE
+2
×5/8
÷2
+7
×1/2
Hard
31
−3
×31/2
HALVE
√
CUBE
+2
÷5
−4
÷13
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).