Negative numbers

(Originally posted at http://joelnoche.multiply.com/journal/item/109/Negative-numbers on August 20, 2012 5:57 AM)

upWhen my daughter just turned four years old, she presented me with a piece of cardboard where she wrote some arithmetic expressions that she wanted me to evaluate (shown at the left).

I told her that I was afraid her questions were too advanced, and that I was worried that she wouldn’t be able to understand my explanations.  I stated to explain why subtracting a greater number from a lesser number is not so easy for someone her age to understand.  She then realized that I was reading her questions upside down.  (See the comment below for the continuation of my story.)

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