Lesson 6.1
Page 267
Ratios
A Ratio i sa comparison of two quantities by division
We will write ratios as fractions
in simplest form
We will simplify ratios involving
measurements
2 cups = 1 pint
4 cups = 1 quart
2 pints = 1 quart
4 quarts = 1 gallon
Cop
y
You may use this on test
16 ounces = 1 pound
12 inches = 1 foot
36 inches = 1 yard
3 feet = 1 yard
When converting measurement for a ratio use the following:
pints to cups
quarts to pints
quarts to cups
gallon to quart
pound to ounces
feet to inches
yard to feet
yard to inches
You may use this on test
Many ways to write ratios
Numbers
Always Reduce
Algebra
If playing basketball
12 baskets in 18 attempts
12:18
12
18
12 to 18
10 of every 30 Americans own a cell phone
15 out of every 100 students like Physical Education
90 to 4
When writing a ratio involving measurements, both
quantities should have the same unit of measurement
Example
Express 8 ounces to 3 pounds
pounds to ounces
• convert ounces to pounds
• Write as fraction
• Reduce
Remember Hint.... 16 ounces = 1 pound
3 pints to four quarts
(convert pints to quarts)
convert quarts to pints
Remember Hint.... 2 pints = 1 quart
Pages 268 - 269
Problems 1- 25
Selected on next 3 slides
1. 12:16
2. 24 out of 60
3. 36:84
4. 50 to 25
5. 15 out of 24
10.
11.
12.
13.
14.
15.
9 out of 15
20 out of 36
4 out of 52
45 out of 60
16 to 10
96 to 3
7. 3 pints to 4 quarts
8. 9 inches to 1 yard
9. 6 gallons to 3 quarts
18. 10 yards to 10 feet
19. 4 ounces to 2 pounds
20. 18 quarts to 4 gallons
21. 6 feet to 14 inches
Lesson 6.2 Unit Rates
$11 for 4 boxes of cereal
How much is 1 box ?
400 miles on 14 gallons
How many miles does your car
(truck) get per gallon of gas?
Page 272
Lesson 6.2 Unit Rates
$11 for 4 boxes of cereal
How much is 1 box ?
400 miles on 14 gallons
How many miles does your car
(truck) get per gallon of gas?
Page 272
Lesson 6.2 Unit Rates
$11 for 4 boxes of cereal
How much is 1 box ?
400 miles on 14 gallons
How many miles does your car
(truck) get per gallon of gas?
Page 272
Usually when dealing with money you will put
the amount first
Lets do a few
Page 272
1A. $18.50 for 5 pounds
1B.
100 meters in 14 seconds
Page 273
Online music store sells 15 songs for $12.00.
iTunes sells 10 songs for $9.00.
What is the best deal?
Page 273
Online music store sells 15 songs for $12.00.
iTunes sells 10 songs for $9.00.
What is the best deal?
Page 273
Online music store sells 15 songs for $12.00.
iTunes sells 10 songs for $9.00.
What is the best deal?
A store sells two different kinds of head phones.
Package of 8 sets for $5.76 and
package of 12 sets for $8.88. What is the
cheapest package?
A store sells two different kinds of head phones.
Package of 8 sets for $5.76 and
package of 12 sets for $8.88. What is the
cheapest package?
A store sells two different kinds of head phones.
Package of 8 sets for $5.76 and
package of 12 sets for $8.88. What is the
cheapest package?
Questions on Lesson 6.2 Page 272
Examples 1 and 2?
Assignment: Page 272 Problems 1 - 7
Also from Lesson 6.1 Page 268-269
Problems 6 - 9 and 18 - 21
Example 3 Page 273
A typical dolphin will take about 34
breaths in 4 hours. How many breaths will
a dolphin take in 7 hours?
Example 3 Page 273
A typical dolphin will take about 34
breaths in 4 hours. How many breaths will
a dolphin take in 7 hours?
Example 3 Page 273
A typical dolphin will take about 34
breaths in 4 hours. How many breaths will
a dolphin take in 7 hours?
Page 273 Guided Practice 3. Classwork
A bakery can make 195 doughnuts in 3 hours. At
this rate, how many doughnuts can the bakery
make in 8 hours?
Questions for Example 3?
Assignment Page 274
Problems 8 - 20