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Help the Captain fix his broken calculator by creating equations for numbers 1 through 20 using only the working buttons: 4, 7, plus, and minus.

Broken Calculator Problem 3 worksheet to make numbers 1-20 using 4, 7, +, and - buttons.

Broken Calculator Problem 3 worksheet to make numbers 1-20 using 4, 7, +, and - buttons.

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