Standards:Mathematical Problem Solving and

Communication:2.5.8.A, 2.5.8.B, 2.5.8.C

Algebra and Functions2.8.8.D, 2.8.8.E

Objectives:use rates and ratios to solve real life problems

use percents to solve and model real life problems

Miss ZeugginSeptember 24th 2008

Chapter 3 Section 8

Rates/Ratios/Percentages

Introductionhttp://www.grocerygogo.com/index.php?tar

get=categories&category_id=316

RatesIf a and b are two measurable quantities,

then the rate of a per b is

Example: miles and hours: miles per hour (mph)

ba

hm

Example of RatesYou drove 152 miles and it took you 2.5

hours to get there. How many miles per hour where you driving?

You spend about $150 dollars a week. About how much per day do you spend?

Using Ratios -comparison of two numbers using division

• Suppose you got a 37/42 on a test and the teacher told you that the grade going into the grade book was going to be out of 100. How would you solve this?

• You want to leave a 15% tip on your dinner from TGIFridays that cost you $80.00. How much of a tip do you need to leave?

Percentages200 people were asked

what game system the liked to play the most:

What percentage of people like to play Wii?

XBOX?

PS3?

Wii126

people

PS322

people

XBOX 36052 people

Class WorkPage 183 #3,7,8,9,11,12,15,16,17

Review for TestJEOPARDY!!!

HomeworkPage 190

1-7,9-14,16-20,22,32