| A | B |
|---|
| addends | The numbers added in an addition problem that are combined to form a sum. |
| addition | An operation that combines two or more numbers to find a total number. |
| commutative property of addition | Changing the order of addends does not affect their sum. |
| identity property of addition | The sum of any number and 0 is equal to the initial number. |
| number sentence | A complete sentence that uses numbers and symbols, but not words. |
| sum | The result of addition. |
| counting numbers | The numbers used to count: 1, 2, 3, . . . . |
| digits | Any of the symbols used to write numbers: 0, 1, 2, 3 . . . |
| sequence | A list of numbers arranged according to a certain rule. |
| place value | The value of a digit based on its position within a number. |
| ordinal numbers | Numbers that describe position or order. |
