The numbers you use for many computation problems are 0, 1, 2, 3, and so on. In algebra, these are defined as *whole numbers,* and they continue without an end. There is always at least one more whole number after the one you are thinking of at the time. Picture a simple ruler or measuring tape that has only whole numbers. It might look like this one, showing the whole numbers up to 6:

But in real life, you need negative numbers, too, such as ...

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