Easy
14
+1
÷5
+14
×3
+5
÷8
−1
×9
−7
Medium
21
DOUBLE
−2
÷4
SQUARE
HALVE
+4
×2/3
+6
×1/7
Hard
57
×2
+3
×2/13
×3
+2
×21/4
÷9
SQUARE
HALVE
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).