This document provides instruction on multiplying and dividing decimals. It includes examples of multiplying decimals to solve real-world problems involving costs. It also covers dividing decimals to convert between units like pounds and kilograms. Finally, it presents a table with data on runners from the 2012 Olympics 100m dash and asks students to calculate their average speeds from the distances and times.

1. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
AIM: Multiplying and Dividing
Decimals
Do Now
Evaluate the following expression using
the order of operations.
20.3 - 2.35 + 40
57.95
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2. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
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3. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
Anticipatory Set
Explain a real life situation where you
may need to multiply two decimals.
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4. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
1.) If at Smithtown High School, School lunches costs $14.50
per week. How much would lunch cost a student after 15.5
weeks?
2.) Emma earns $11.75 per hour for gardening. If she worked
21 hours this month, then how much did she earn?
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5. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
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6. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
3.) Jake‛s car gets 29.7 miles per gallon on the
highway.
a.) If his fuel tank holds 10.45 gallons, then how far
can he travel on one full tank of gas?
b.) If gas costs $4.10 per gallon how much will it cost
for Jake to fill up his gas tank?
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7. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
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8. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
Dividing Decimals
1.) Most countries in the world use kilograms as their unit
of mass. If I ship a package from Spain that is 31.5
kilograms, what would the mass be in pounds? (There are
0.45 kilograms in a pound.)
2.) If someone weighs 111.1 pounds, what would their
weight be in kilograms? (There are 2.2 pounds in a kilogram)
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9. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
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10. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
The following table shows the results of the 2012
Olympic 100 meter dash. Use the information in the
table to find each runner‛s average speed.
Athlete Distance Time Average Speed
Usain Bolt
100 meters 9.63 seconds
(Gold)
Yohan Blake
100 meters 9.75 seconds
(Silver)
Justin Gatlin
100 meters 9.79 seconds
(Bronze)
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11. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
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12. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
Before You Leave
Convert your weight from pounds to kilograms.
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13. Day 10 Multiply and Divide Decimals.notebook September 21, 2012
Homework
Cumulative Review
Sheet due Tuesday
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