Question

Estimation: Sum & Difference

Estimate the sum or difference by rounding each decimal to the nearest whole
number.
1)
45.24
+ 17.53
2)
76.6
+35.1​

Answer 1

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Answer 2

➺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.

⇒