Easy
13
+6
×5
−13
÷2
+14
÷5
−3
HALVE
+17
Medium
13
×8
−17
DOUBLE
−3
÷9
+2
÷3
SQUARE
×3
Hard
73
×2
+4
×3/5
HALVE
+3
÷12
+2
×11/3
×8
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).