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The absolute value of a number is it's distance from 0.

The absolute value of a positive number is the number itself while a negative number's absolute value is -1 multiplied to the number.

So -3*-1=3

Therefore the absolute value is 3.

We can also list from -3 until 0

-3, -2, -1, 0

The number of spaces in between is 3 so the absolute value is 3