Across
- 3. states that when you change the order of addends, the sum will stay the same
- 4. a number that is close to an exact amount after being rounded
- 5. states that when the grouping of addends changes, the sum will stay the same
Down
- 1. mathematical operations that undo each other by doing the opposite
- 2. states that when you add any number by zero, the sum with always be that number