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    Properties of addition and mutiplication puzzle : ...The remaining digits should be your telephone number.

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    Follow the steps to see if the puzzle works.

    § Start with 60 and divide by 2.
    § Add your telephone number.
    § Subtract 25.
    § Multiply by 3.
    § Subtract 15.
    § Multiply by 2
    § Divide by 6.

    The remaining digits should be your telephone number. Why does this work? What properties of addition & multiplication is this problem utilizing?

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    Solution Summary

    A puzzle is solved usng properties of addition and mutiplication.