Easy
8
×8
−6
HALVE
−1
÷7
+5
SQUARE
+4
÷5
Medium
32
−13
DOUBLE
+4
÷6
−1
×1/2
×7
−10
SQUARE
Hard
64
+2
×31/3
+44
HALVE
+3
×5/9
×2
−10
×25%
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).