First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.Sheri wanted to know the total number of hours she worked this week. Her time card indicated the following hours: Monday, 6.18 hours; Tuesday, 10.09 hours; Thursday, 5.12 hours. How many hours has Sheri worked?
A. Estimate: 19 hours; exact: 22.39 hours
B. Estimate: 21 hours; exact: 21.39 hours
C. Estimate: 20 hours; exact: 21.39 hours
D. Estimate: 21 hours; exact: 22.39 hours
Answer: B
Mathematics
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