Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 9 - Measurement - Chapter 9 Test: 11

Answer

b. $100~cm^2$

Work Step by Step

If a dollar bill is 5 cm long and 2 cm wide, then it would have an area of $10~cm^2$. Clearly, these dimensions are too small for a dollar bill. If a dollar bill is 15 cm long and 6 cm wide, then it would have an area of $90~cm^2$. These dimensions seem reasonable for a dollar bill so an estimate of $100~cm^2$ is a good estimate. If a dollar bill is 40 cm long and 25 cm wide, then it would have an area of $1000~cm^2$. Clearly, these dimensions are too large for a dollar bill, so an estimate of $1000~cm^2$ is too large. Clearly $1~m^2$ is much too large for the area of a dollar bill, since a square with sides of 1 meter has an area of $1~m^2$. The area of a dollar bill is approximately $100~cm^2$.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.