| A | B |
|---|
| Prime number | is a natural number greater than 1 whose only factors are 1 and itself |
| Composite number | is a natural number greater than 1 which has factors in addition to 1 and itself |
| Whole numbers | union of the natural numbers and 0 |
| Natural numbers are also called the | Counting numbers |
| Integers | union of the whole numbers and the negative natural numbers |
| Rational numbers | can be expressed as fractions |
| Set | a collection of objects |
| Elements | members of a set |
| Irrational numbers | non-repeating, non-terminating decimals |
| Real numbers | union of the rationals and irrationals |
| Variable | a letter used to represent a number |
| Constant | a number |
| Graph of a real number | dot on the number line |
| If a is to the left of b on the number line then a is | less than b |
| Absolute value of zero is | zero |
| Roster method of describing a set | lists the elements |
| Empty set | contains no elements |
| Union of sets A and B | all elements of either A or B |
| Intersection of sets A and B | elements of both A and B |
| Interval notation | method of indicating a set using ( , ] |
