Warm-up Date 01/25/10 Chapter 6 Pre-View

Write in simplest form.

301) 35

242) 40

543) 60

124) 15

145) 42

406) 24

67

35

910

45

13

5 2, or 13 3

Goal: To write and simplify

ratios

To find rates and unit rates

…And WhyTo solve real-world

problems involving unit prices, gas mileage, and

speed

Key Words:ratio:

A comparison of two quantities by division.A ratio can be written in different ways.

Arithmetic

Algebraic

1010 to 15 10 : 15 15

to : , for 0aa b a b bb

Key Words:rate:

A ratio that compares quantities in different units.

Examples:pointsmiles cost or or

gallons pound game

unit rate: A rate with a denominator of 1.

Examples: miles per hour, miles per gallon, cost per ounce

Find each unit rate.a) A skydiver falls 144 ft in 3s.

144 ft3 s

48 ft/s

b) A pump moves 42 gal in 7 min.42 gal7 min 6 gal/min

c) A car travels 676 mi in 13 h.676 mi13 h

52 mi/h

d) 20 c of water evaporates in 5 days.20 c

5 days 4 c/day

Write each ratio as a fraction in simplest form.

After-School Jobs

Response Number

Have a Job 40

60

100

Don’t Have a Job

Total

A survey asked students whether they had after-school

jobs. Write each ratio as a fraction in its simplest form.

a) Students with jobs to students without jobs

students with jobsstudents without jobs

4060

23

b) Students without jobs to all students surveyedstudents without jobsall students surveyed

60100

35

Write three different ratios for each model.

5 to 3 5 : 353

4 to 5 4 : 545

Write each ratio as a fraction is simplest form.

a) 36 to 483648

34

b) 60 is to 246024

52

c) 16 out of 121612

43

d) 15 : 27 1527

59

Did we achieve our goal?

To write and simplify ratios

To find rates and unit rates

Web Site: PhSchool.com

Tutor Code: ade-0601

Lesson Quiz Code: ada-0601

Write today’s goal.

Write today’s assignment.

Practice 6-1

Reflective Journal