Faulty Button

A Maths Starter of The Day

One of the keys on a calculator is faulty. When you press it you get a different number. When the following keys are pressed the red numbers appear in the display. Which is the faulty key?

677
204
624
711
538



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Keywords: Starter | Arithmetic | Calculator | Problem Solving

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    Answer

    The faulty key is 7
    It produces a 2