Easy
15
+1
÷8
+18
÷5
SQUARE
−7
×4
+6
÷7
Medium
34
+1
×3/7
−4
SQUARE
+5
×5/9
−2
÷4
−7
Hard
79
−9
×2/5
−8
÷10
+1
×31/3
SQUARE
+5
÷7
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).