Easy
8
−1
SQUARE
+1
÷2
−13
×7
+2
HALVE
+11
Medium
51
DOUBLE
−16
HALVE
−18
×5
+1
×7/9
−3
×2
Hard
88
×25%
HALVE
SQUARE
+1
×31/2
−1
×11/3
+4
÷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).