What are the method of checking addition?

To check addition, you can use the following methods:

1. Re-addition: Simply perform the addition again to see if you obtain the same result.
2. Estimation: Round the numbers to their nearest ten or hundred, add those, and compare this estimate to the original sum for reasonableness.
3. Inverse Operation: Subtract one of the addends from the sum; if the result equals the other addend, the addition is likely correct.