1. Circle the better estimate for each sum or difference. a) 516 + 194 600 or 700 b) 401 + 394 700 or 800 c) 385 - 126 200 or 300 d) 613 - 209 300 or 400

To find a better estimate for each sum or difference, let's round the numbers to the nearest hundred to make the calculation simpler.

For 516 + 194 :

Round 516 to 500.
Round 194 to 200.
Adding these rounded numbers gives approximately 700.
So, the better estimate is 700 .


For 401 + 394 :

Round 401 to 400.
Round 394 to 400.
Adding these rounded numbers gives approximately 800.
So, the better estimate is 800 .


For 385 - 126 :

Round 385 to 400.
Round 126 to 100.
Subtracting these rounded numbers gives approximately 300.
So, the better estimate is 300 .


For 613 - 209 :

Round 613 to 600.
Round 209 to 200.
Subtracting these rounded numbers gives approximately 400.
So, the better estimate is 400 .



In each case, rounding the numbers to the nearest hundred helps to quickly estimate the sum or difference.

Answered by OliviaMariThompson | 2025-07-21