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Using each of the four digits at the top once, construct an expression that evaluates to an integer between 1 and 20 via any combination of the following operators:

- addition +
- subtraction -
- multiplication *
- division /
- parentheses ()
- Note: operators can be repeated. Ex: 1 + 2 + 3 + 4

Example: Given the digits 1 2 3 4, one possible expression that evaluates to 9 is: 4 * (2 + 1) - 3.

Click on any bar or integer on the Solutions chart to see a list of solutions for that integer.