Question

B. A. Estimate first, then name the sum or difference. Use your estimate to check your work 27348-1267 ans

​

Answer 1

Answer:

The first step in estimating a sum or a difference is to round the numbers, by changing them to the nearest power of ten, hundred, thousand, etc. Round the numbers first, then use mental math to estimate an answer. When rounding, follow these rounding rules: If the number being rounded is less than 5, round down.