Question

A student solved this problem and said the answer was 78.

Answer 1

It's B.) The student’s answer is not reasonable. Estimation: 170 + 90 = 260

Answer 2

The answer is B because if you round to the nearest 10, B would be the answer. C is not correct because 93 rounded to the nearest 5 (like 175) is not 100. A is not correct because the estimation is not reasonable. D is also not correct because you would need to add the numbers, not subtract.