2 thoughts on “Estimation: Sum & Difference<br /><br />Estimate the sum or difference by rounding each decimal to the nearest whole<br />numb”

➺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. … If the number being rounded is less than 5, round down.

➺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. … If the number being rounded is less than 5, round down.

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