Unit 2 Section 9 Conversions.notebook
October 27, 2015
Oct 6­3:41 PM
Rates, Ratios and Conversions
Unit 2
Jul 31­9:19 AM
Unit 2 Section 9 Conversions.notebook
October 27, 2015
Rates and Ratios
Ratio ­ a comparison of two numbers. (ratio must be in the same units)
Examples: 5 to 3 5:3 5
3
Rate ­ a ratio that compares two unlike terms
Example: 180 miles 3 hours Unit Rate ­ the rate for one unit of a given quantity
Example: 180 miles the unit rate is 60 miles or 60 mi/h
3 hours
1 hour
Nov 15­8:01 AM
Example 1: What is the better buy, 6 bagels for $3.29 or 8 bagels for $4.15?
Nov 15­7:58 AM
Unit 2 Section 9 Conversions.notebook
October 27, 2015
A conversion factor is a ratio of two equivalent measure in different units.
1 ft
A conversion factor is always equal to 1, such as .
12 in
Take out your formula sheets for a list of common equivalent units of measure.
Copy these additional conversions down. They will be helpful for converting between systems.
1 mile = 5280 ft
1 kg ≈ 2.2 lb
1 m ≈ 3.28 ft.
1 gal ≈ 3.8 liters
1 yd= 3 ft
1 gal = 4 quarts
1 ft = 12 in
Nov 12­8:46 PM
Example 2: What is the given amount converted to the given units?
(Use a conversion factor!)
a) 330 min; hours
b) 15 kg; grams
c) 3 yards; inches
Nov 12­8:50 PM
Unit 2 Section 9 Conversions.notebook
October 27, 2015
Example 3: The CN Tower in Toronto, Canada, is about 1815 ft tall. About how many meters tall is the tower? Nov 12­8:53 PM
Example 4: A student ran the 50­yd dash in 5.8 s. At what speed did the student run in miles per hour? Round your answer to the nearest tenth.
Nov 12­8:55 PM
Unit 2 Section 9 Conversions.notebook
October 27, 2015
Example 5: What is the given amount converted to the given units?
a) 2 qt/min = __ gal/s
b) 2.2 kg = ___ lb
c) 60 ft/s = ___ km/h
Nov 15­7:56 AM
Homework:
Homework Packet
page 21
Oct 6­3:47 PM
Unit 2 Section 9 Conversions.notebook
October 27, 2015
Oct 6­3:47 PM