1. Each key represents a number.
Solve each equation to get the answer, then place the keys that represents that answer.
First row: 56-36 = 20
Second row: 89-83 = 6
Third row: 15+28 = 43
Fourth row: 27+48 = 75
Drag the keys on the bottom to make each answer.
Look at the screenshot above to see what goes where.
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2. Proceed to the next level!