Easy
19
−8
×3
−17
÷8
+10
HALVE
−1
SQUARE
+13
Medium
46
−9
DOUBLE
+4
÷6
+1
÷2
−1
×1/3
×2
Hard
35
×3
×21/3
+2
×11/13
−1
÷13
+11
×5
−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).