| A | B |
| natural numbers | counting numbers |
| whole numbers | nonnegative integers |
| integers | whole numbers and their opposites |
| rational number | real number that can be written as the ratio of two integers |
| irrational number | a number that in decimal form is nonterminating and nonrepeating |
| real number | number that is either rational or irrational |
| inequality | a mathematical sentence that compares two expressions using an inequality symbol |
| equation | an mathematical sentence |
| absolute value | the distance from zero on a number line |
| additive inverse | the opposite of a number |
| multiplicative inverse | the reciprocal of a given number |
| compound inequality | an inequality joined by the word AND or OR |
| order of operations | the steps to evaluate algebraic expressions |