# Negative Numbers Homework

Adding with two-color counters is actually quite easy.You model the first number with a pile of chips flipped to the correct side and you also model the second number with a pile of chips flipped to the correct side, then you mash them all together, take out the zeros (if any) and voila! Since there are a few confused faces in the audience, let us explain a little further.

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Taking out the zeros means removing as many pairs of yellow and red chips as you can.

You do this because -1 and 1 when added together equals zero (this is called the zero principle).

If you've ever spent time in Canada in January, you've most likely experienced a negative integer first hand.

Banks like you to keep negative balances in your accounts, so they can charge you loads of interest.

For example, 5 - (-5), would require five yellow chips to start and would also require the removal of five red chips, but there aren't any red chips! Adding or subtracting zero (a red chip and a yellow chip) has no effect on the original number, so we could add as many zeros as we wanted to the pile, and the number would still be the same.

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