| A | B |
|---|
| addend | one of the numbers being added in an addition problem |
| fact family | a set of related addition and subtraction sentences |
| inverse operations | operations that undo each other |
| Order Property of Addition | two numbers can be added in any order and the sum is the same |
| Identity Property of Addition | when adding zero to a number, the sum is that number |
| Grouping Property of Addition | grouping addends in different ways does not change the sum |
| addend example | 2 + 4 = 6 The 2 and 4 are these |
| fact family example | 8+5=13 5+8=13 13-5=8 13-8=5 |
| inverse operations example | 4+6=10 10-4=6 |
| Order Property of Addition example | 6+5=11 and 5+6=11 |
| Identity Property of Addition example | 5+0=5 |
| Grouping Property of Addition example | (1+3)+7=11 1+(3+7)=11 |
