Problem of the Week 10_23

Season: 

10

Problem ID Number: 

23

Week Of: 

Monday, March 15, 2010

Due Date: 

Thursday, March 18, 2010

Grade Levels: 

7-8

Content Standards: 

Grade 7, NS 1.2, 1.2 MG 1.1, 2.1

Problem Of the Week Printout: 

POW 23.pdf

On earth, land covers 57,491,000 square miles and water covers 139,397,000 square miles.

1. What is the earth’s radius? (Hint: SA sphere = 4πr2)
2. Using scientific notation, write a simplified ratio comparing the earth’s land surface to its water surface.
3. If there are 6,831,050,195 people on earth’s land surface, what is the average number of people per square mile?

Show all work. Be sure to answer each question and state your solutions using complete sentences. (Attach additional pages as necessary)

Fresno County Office of Education • Larry Powell, Superintendent
Melinda Riccardi, Math On Call Program Producer, mriccardi@fcoe.org (559) 265-4044
Fax: (559) 265-3041
2009-2010