Which is greater?
311,591,917 or 6,973,738,433
But how much
greater is it?
In this lesson you will learn
how to make rough
comparisons of very large
numbers by using scientific
notation.
Let’sReview
Review
Let’s
Writing a large number in scientific notation.
310,000,000
Answer: 3.1 × 10
8
A Common
Let’s
Review Mistake
Which is greater?
6 × 10
8
5 × 10
9
600,000,000
5,000,000,000
Core
Lesson
Let’s
Review
U.S. population: 311,591,917
World population: 6,973,738,433
About how many times greater is the
world population?
8
U.S.: 3 × 10
2 times 10
9
Answer: about 20
World: 7 × 10
times greater
Core
Lesson
Let’s
Review
U.S. population: 311,591,917
Vermont population: 626,431
About how many times greater is the
U.S. population?
87
2
U.S.: 331××1010
5 times 10 or 100
5
Answer: about 500
Vermont: 6 × 10
times greater
In this lesson you have
learned how to make rough
comparisons of very big
numbers by using scientific
notation.
Guided
Practice
Let’s
Review
The Pacific Ocean covers 63,784,077
square miles. Lake Michigan covers
22,394 square miles. About how many
times greater is the Pacific Ocean?
Extension
Let’s
Review Activities
Use scientific notation to estimate the
number of seconds in a millennium.
Extension
Let’s
Review Activities
Use scientific notation to estimate the
number of inches in a light-year.
Quick Quiz
Let’s
Review
In 2011, the population of New York
City was 8,244,910 and the
population of Honolulu was 374,658.
About how many times greater was
New York City?