Easy
3
×4
−3
SQUARE
−1
HALVE
+2
÷3
+4
÷6
Medium
40
−13
×6
×1/2
−5
DOUBLE
−2
×2/3
+2
÷6
Hard
21
×4
×21/2
HALVE
−6
÷9
SQUARE
+4
×13/5
−17
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).