Easy
10
−1
×7
+12
÷5
−6
SQUARE
−19
HALVE
+10
Medium
12
×2/3
DOUBLE
−10
×8
−6
×3/7
HALVE
SQUARE
−9
Hard
45
+10
÷11
SQUARE
+1
×21/2
+35
√
+2
÷6
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).