Arithmetic/Numbers Less Than Zero

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Although we cannot have less then nothing in real life, we have to assume that since you can go all the way in one direction in counting up, that you can continue to count down in the other direction. These numbers are called negatives, for they have less the nothing. These are easiest to learn how to use in operation using a Number Line

[edit] Examples

-3 (pronounced "Negative Three" not "Minus Three)
-5
-10
-11

5 - 7 = -2
10 - 19 = -9

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