Easy
8
+18
HALVE
+5
÷6
+1
×6
−17
×8
−10
Medium
14
×7
×3/7
×3
−9
DOUBLE
−16
HALVE
+3
÷7
Hard
60
×31/2
×30%
−12
×2
−4
×3/7
÷7
−1
CUBE
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).