Easy
7
+8
÷5
+2
×5
−19
HALVE
+19
÷2
−1
Medium
50
DOUBLE
+2
÷3
+6
÷8
SQUARE
−1
×1/2
×8
Hard
56
−1
÷11
CUBE
−15
HALVE
+10
×10/13
+49
×2
There are two versions that can be printed, a default one, and one that requires less ink (no objectives or rules, and no lines).