Easy
5
SQUARE
−19
HALVE
+1
×7
+4
÷8
+10
×2
Medium
21
×6
−2
×1/2
+1
÷3
−12
SQUARE
+3
÷7
Hard
94
+2
÷12
−2
×21/3
×6
×25%
×7
−4
×2/11
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).