Transcript Document

How can you estimate a quotient of
large numbers?
Dist. from sun to Earth: 150,000,000,000 m
Speed of light: 300,000,000 m/s
How long for light to go from sun to Earth?
In this lesson you will learn
to estimate quotients by using
scientific notation.
Let’sReview
Review
Let’s
Divide 9 × 10
9 × 10
15
7
3 × 10
15
7
by 3 × 10 .
= 3 × 10
8
A Common
Let’s
Review Mistake
Divide numbers in correct order!
Dist. from sun to Earth: 150,000,000,000 m
Speed of light: 300,000,000 m/s
How long for light to go from sun to Earth?
150,000,000,000
300,000,000
Core
Lesson
Let’s
Review
Dist. from sun to Earth: 150,000,000,000 m
Speed of light: 300,000,000 m/s
How long for light to go from sun to Earth?
11
3
2
1.5 × 10
= 0.5 × 10 = 5 × 10 seconds
8
3 × 10
In this lesson you have
learned to estimate quotients
by using scientific notation.
Guided
Practice
Let’s
Review
Approximate total mass of all humans:
400,000,000,000 kg
Approximate number of humans:
6,970,000,000
What’s the average mass per person?
Extension
Let’s
Review Activities
“Back-of-the-envelope” calculations
For example: How many grains of rice
would it take to fill the room you’re in?
Extension
Let’s
Review Activities
Calculate the percent error of some of the
estimates in this lesson.
Quick Quiz
Let’s
Review of Olympic swimming pool:
Volume
2,500,000 liters
Volume of Lake Mead:
35,000,000,000,000 liters
How many swimming pools to fill Lake Mead?
Quick Quiz
Let’s
Review
Dist.
from sun to Mars: 220,000,000,000 m
Speed of light: 300,000,000 m/s
How long for light to go from sun to Mars?