Verified Answer :

You can explain how you can use rounding or compatible numbers to see if your answer is reasonable by saying, "Rounding helps to see if your answer is reasonable. This is so because if the number you estimated was close to the answer it is a reasonable answer." I hope this helps you (:

Using rounding is a quick, easy way to check if your answer is reasonable. If your answer is close to the rounded anwer, this shows that your answer is probably right.