1. Negative Sign
Attaching this sign to a number means reflecting that number across zero on the number line.

2. A quantity without bound or end.
Infinity
A quantity without bound or end.

3. Numbers to the left of a zero on the number line.
Negative Numbers
Numbers to the left of a zero on the number line.

4. A plus sign attached to a number to show that it is a positive number.
Positive Sign
A plus sign attached to a number to show that it is a positive number.

5. Ellipses
The three periods before and after the set. They are used to represent infinity in a number set.

6. The set of whole numbers with their opposites.
Integers
The set of whole numbers with their opposites.

7. Density Property
States that between any two rational numbers there is another rational number.

8. Fractional Numbers
The set of all numbers that can be written as a/b, where a and b are whole numbers and b is not equal to 0.

9. Rational Numbers
Numbers that can be written as a/b, where a and b are integers, but b is not equal to 0.

10. A number’s distance from zero on a number line.
Absolute Value
A number’s distance from zero on a number line.

11. Word
definition