A student solved this problem and said the answer was 78.
There were 171 people who came to the play in the afternoon. In the evening, there were 93 more people at the play than in the afternoon. How many people came to the play in the evening?
Which estimation strategy correctly checks whether the student’s answer is reasonable?
A.
The student’s answer is reasonable. Estimation: 170 – 90 = 80
B.
The student’s answer is not reasonable. Estimation: 170 + 90 = 260
C.
The student’s answer is not reasonable. Estimation: 175 + 100 = 275
D.
The student’s answer is not reasonable. Estimation: 200 – 100 = 100
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.
