Easy
16
−3
×7
+2
÷3
−1
÷2
+3
HALVE
+13
Medium
48
−6
÷7
−1
×9
+3
×1/2
÷4
SQUARE
HALVE
Hard
35
+1
÷9
+4
×3/4
×4
×41/4
÷3
+24
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).