Unit 7 Contents

12. A traffic reporter in a helicopter flies over a traffic jam. Below is a picture of the cars she sees on the highway. She knows the distance between the two bridges is of a mile. Use estimation to answer the following questions. Show or tell how you found your answer.

1. Estimate the number of cars on the stretch of highway in the picture.
2. If the traffic jam went on for a distance of one mile, about how many cars would be in the traffic jam?
3. If the traffic jam went on for a distance of five miles, about how many wheels would be in the traffic jam?

Check-In: Questions 13–16

13. Jerome's family decides to take the following trip: Chicago to Indianapolis, Indianapolis to Louisville, and Louisville back home to Chicago. About how many miles will they drive altogether?
14. Their car goes about 21 miles on one gallon of gasoline. At the start of the trip in Chicago, their gas gauge shows about 12 gallons of gas.
1. About how many miles can they travel on 12 gallons of gas?
2. Will they have to get more gas before they reach Indianapolis? Before they reach Louisville?
15. At the time they were leaving, gasoline cost about $2.89 per gallon in Chicago. They estimated that they would need about 28 gallons of gas in all to make the trip. If gas costs about the same in other cities as in Chicago, about how much money will they spend for gas on the trip?
16. Jerome's parents averaged 48 miles per hour on the entire trip. By the time they got back to Chicago, did the family drive for more or less than 8 hours? How did you decide?

Use the Our Best Estimate pages in the Student Activity Book to practice estimating products.