Mary is labeling tick marks on a number line. Start- ing at a tick mark labeled 4.90, she labels the next tick marks to the right with 4.91, 4.92, 4.93, ..., 4.99. Then she labels the next tick mark to the right of 4.99 with 4.100. Mary then says that 4.100 is greater than 4.99. a. Discuss: What error is Mary making? Why might Mary make this error? b. Describe how you might help Mary understand her error and how to correct it.

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter8: Sequences, Series,and Probability
Section8.6: Counting Principles
Problem 8ECP: In how many different ways can two letters be chosen from the letters A, B, C, D, E, F, and G? (The...
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6. Mary is labeling tick marks on a number line. Start-
ing at a tick mark labeled 4.90, she labels the next
tick marks to the right with 4.91, 4.92, 4.93, ...,
4.99. Then she labels the next tick mark to the right
of 4.99 with 4.100. Mary then says that 4.100 is
greater than 4.99.
a. Discuss: What error is Mary making? Why
might Mary make this error?
b. Describe how you might help Mary understand
her error and how to correct it.
Transcribed Image Text:6. Mary is labeling tick marks on a number line. Start- ing at a tick mark labeled 4.90, she labels the next tick marks to the right with 4.91, 4.92, 4.93, ..., 4.99. Then she labels the next tick mark to the right of 4.99 with 4.100. Mary then says that 4.100 is greater than 4.99. a. Discuss: What error is Mary making? Why might Mary make this error? b. Describe how you might help Mary understand her error and how to correct it.
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