What can’t we divide by zero?
Why do we move the decimal point when dividing by a decimal?
Why is a “negative times a negative a positive?”
Why is any number raised to the zero power equal to one?
Usually, the teacher would simply answer “That is the way I learned how,” or “Just because,” or “That’s the rule,” or “I don’t know; that is how I have always done it.”
Author Sean Monroe's book: But Why? - Unraveling the Mysteries of Mathematics attempts to answer these questions along with dozens more by utilizing different methods to help readers make sense of concepts, procedures and steps, techniques, conventions, and vocabulary used in mathematics that are rarely explained.
With 30 mysteries to unravel, this fun and informative book takes a closer look at some of the possible questions that could come up in a classroom setting and then develops some reasoning behind them.