Easy
12
−2
×8
−18
HALVE
+4
÷7
+2
SQUARE
+10
Medium
53
DOUBLE
+2
×1/3
−9
×5
−2
×5/7
+1
÷8
Hard
122
+2
×41/4
+6
×9/13
+7
÷8
+3
÷5
×90%
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).