Download presentation

Presentation is loading. Please wait.

Published byHarry Daniels Modified over 2 years ago

1
Ratios & Rates

2
Objective: 7.1.01 Develop and use ratios, proportions, and percents to solve problems. Essential Questions: What are the differences between ratios, rates, and unit rates? Ratios & Rates

3
Vocabulary: Ratio: a comparison of two numbers by division. Equivalent Ratios: two or more ratios that form equivalent fractions. (Example: 1/2 = 5/10) Rate: a ratio of two measurements having different kinds of units. (Example: buy 7 pencils for $2) Unit Rate: a rate that has been simplified so it has a denominator of 1. (Examples: $9 per pound; 6 ounces per serving) Ratios & Rates

4
So What Do We Really Use Ratios for In The Real World… RATES & UNIT RATES But Before We Can Look At Rates And Unit Rates We Have To Understand Ratios Ratios & Rates

5
Real World: Two different packages of batteries are shown below. Determine which is less expensive per battery, the 4-pack or the 8-pack. 4-pack $3.608-pack $6.80 4-pack $3.608-pack $6.80 We know the 8-pack is a better deal per battery Ratios & Rates

6
But Before We Can Really Understand Rates And Unit Rates We Have To Understand Ratios Ratios & Rates

7
(1) What is the ratio of soccer balls to the total number of balls? 6 to 14 6:14 6 out of 14 6 / 14 3 to 7 3:7 3 out of 7 3 / 7 (2) What is the ratio of basketballs to the total number of balls? 8 to 14 8:14 8 out of 14 8 / 14 4 to 7 4:7 4 out of 7 4 / 7 Ratios & Rates

8
Lets Look At Some… Ratios Ratios & Rates

9
Example 1: Write a ratio that compares the number of footballs to the number of soccer balls. # of Footballs TO # of Soccer Balls 4 to 6 OR 4:6 OR 4/6 2 to 3 OR 2:3 OR 2/3 Ratios & Rates

10
Example 1: Write a ratio that compares the number of footballs to the number of soccer balls. Footballs4 2 Soccer Balls63 ▪ The ratio of footballs to soccer ▪ The ratio of footballs to soccer balls is 2:3, 2/3 or 2 to 3. balls is 2:3, 2/3 or 2 to 3. ▪ For every 2 footballs there ▪ For every 2 footballs there are 3 soccer balls. are 3 soccer balls. Ratios & Rates

11
Example 2: Write a ratio that compares the number of hamburgers to the number of snacks. # of Hamburgers TO Total # of Snacks 4 to 12 OR 4:12 OR 4/12 1 to 3 OR 1:3 OR 1/3 Ratios & Rates

12
Example 2: Write a ratio that compares the number of hamburgers to the number of snacks. Hamburgers 4 1 Snacks12 3 ▪ The ratio of hamburgers to snacks is 1:3, 1/3 or 1 to 3. ▪ There is 1 hamburger for every 3 snacks. ▪ For every 3 snacks 1 is a hamburger. Ratios & Rates

13
Example 3: The ratio of the number of bones in a human’s ears to the total number of bones in the human skull is 3:11. If there are 21 bones in the human ear, how many bones are in the human skull? 6 bones in the human ear Ratios & Rates

14
Example 4: The ratio of the number of games won to the number of games lost last season was 3:2. If the basketball team won 18 games last season, how many did they lose? The team lost 12 games Ratios & Rates

15
Lets Look At Some… Rates & Unit Rates Ratios & Rates

16
What about the G-UNIT RATE: (1) When a rate contains a denominator of 1, we call this a unit rate. (2) We can use unit rates to determine whether deals are good or bad. (3) For instance, is it better to buy four individual rolls of paper towels for $1.29 each, or a pack of four for $5.04. Ratios & Rates

17
Example 5: Dr. Rodriguez drove 391 miles on 17 gallons of gas. How many miles could he have driven with just one gallon of gas? ÷17 ÷17 391 miles w miles 391 miles w miles 17 gallons 1 gallon 17 gallons 1 gallon ÷17 ÷17 Answer: 23 miles/gallon Answer: 23 miles/gallon Ratios & Rates

18
Example 6: Mr. Williams was at Wal-Mart buying some wrapping paper to wrap his Christmas presents. The paper he bought was $2.73 for 7 yards of paper. What was the cost per yard? ÷7 ÷7 $2.73 x dollars $2.73 x dollars 7 yards 1 yard 7 yards 1 yard ÷7 ÷7 Answer: $0.39 per yard Answer: $0.39 per yard Ratios & Rates

19
Example 7: Is it better to buy four single rolls of paper towels for $1.29 each, or a pack of four for $5.04? By how much? The 4-Pack is Cheaper By $0.06 Ratios & Rates

20
Example 8: Jacob filled his 60 gallon fish tank in 5 minutes. How fast was water being poured into the tank? ÷5 ÷5 60 gallonsw gallons 60 gallonsw gallons 5 minutes 1 minute 5 minutes 1 minute ÷5 ÷5 Answer: 12 gallons per minute Answer: 12 gallons per minute Ratios & Rates

21
Independent Practice: Express as a ratio in simplest form. 1. 3 sailboats to 6 motorboats 2. 14 lions to 10 tigers Express each as a unit rate. 3. $18 for 3 CDs 4. 8 tomatoes for $4.40 Ratios & Rates

22
Independent Practice: Answers. 1. 3/6 or 3:6 or 3 to 6 2. 7/5 or 7:5 of 7 to 5 Answers. 3. $6 per CD 4. 1 tomato for $0.55 or $0.55/tomato Ratios & Rates

23
Independent Practice: Express as a ratio in simplest form. 1. 5 ducks to 10 geese 2. 15 roses to 10 carnations Express each as a unit rate. 3. 48 televisions on 4 trucks 4. $5.28 for 24 pencils Ratios & Rates

24
Independent Practice: Answers. 1. 1/6 or 1:6 or 1 to 6 2. 5/4 or 5:4 of 5 to 4 Answers. 3. 12 televisions/truck 4. $0.22/pencil Ratios & Rates

25
Real World: As you all know, cans of Coca-Cola are sold in different size packages. For instance, Piggly Wiggly currently has the following Coca-Cola packages on sale for the following prices. Which of the four is the best deal? If I wanted to buy 48 cans of Coke, what would be the best to do it? $0.65 $2.99 $4.08 $9.12 $0.65 $2.99 $4.08 $9.12 Ratios & Rates

26
HOMEWORK

Similar presentations

Presentation is loading. Please wait....

OK

Ratios, Rates, and Proportions

Ratios, Rates, and Proportions

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Download ppt on indus valley civilization for kids Ppt on coalition government define Download ppt on fundamental rights and duties of a citizen Ppt on mass energy equation Ppt on different solid figures chart Ppt on natural resources for class 4 Ppt on production and operations management Download ppt on bhuj earthquake 2001 Ppt on building information modeling revit View ppt on iphone