| A | B |
|---|
| difference | the answer to a subtraction problem |
| subtract | to take away the lesser number from the greater number |
| regroup | to trade equal amounts when renaming a number |
| estimate | round to find a nearby number |
| subtraction sentence | a number sentence in which one quantity is taken away from another quantity |
| inverse operations | two operations that can undo each other |
| examples of inverse operations | addition and subtraction |
| unknown | a missing number |
