Press the "C" key before starting a new calculation
Click
here to open activity in new window (The press F11 to hide tool bars)

Other broken calculators:
BIDMAS 1 and 5 - 2 and 3 - 3 and 4 - 4 and 5 - 5 and 2
Left To Right (LTR): 2 and 3 - 3 and 4 - 4 and 5

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