Easy
7
+8
×5
+16
÷7
−3
×2
−4
HALVE
−2
Medium
50
HALVE
−10
×3
−1
×1/2
×5
−19
DOUBLE
−17
Hard
48
×25%
÷6
CUBE
+4
×3/4
SQUARE
+10
÷13
+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).