Which of the following is the estimated sum of 87 and 110 using compatible numbers? A. 100 B. 160 C. 200 D. 260
Question
Which of the following is the estimated sum of 87 and 110 using compatible numbers?
A. 100
B. 160
C. 200
D. 260
Solution
The process of estimating the sum of 87 and 110 using compatible numbers involves rounding the numbers to the nearest ten or hundred that makes them easier to add.
Step 1: Round the numbers to the nearest ten.
- 87 rounds down to 90 because it is closer to 90 than 100.
- 110 rounds down to 110 because it is exactly 110.
Step 2: Add the rounded numbers.
- 90 + 110 equals 200.
So, the estimated sum of 87 and 110 using compatible numbers is 200. Therefore, the answer is C. 200.
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