Easy
12
−1
×7
−2
÷5
−7
SQUARE
+2
÷6
+3
Medium
43
DOUBLE
−6
÷8
SQUARE
HALVE
−5
×4/9
+1
÷3
Hard
50
−5
÷9
CUBE
+15
HALVE
+2
÷6
×25%
×8
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).