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# Ratios intro

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### Ratios intro

1. 1. Room 83Introduction to RATIOS! Fall 2011
2. 2. What are ratios?• Ratios are ways that we can compare numbers.• In this lesson, there are three ways you will be asked to compare.
3. 3. 1. part-to-part ratioThis is a ratio that compares a partof the whole to another part of thewhole.Example:There are ten boys to thirteengirls in this class.So the ratio is written likethis: 10:13
4. 4. Now we practice...For the snack pile in front of you write the ratios comparing:a) Cheerios to squaresb) squares to raisinsc) raisins to cheerios
5. 5. 2. part to whole ratio This is a ratio that compares part of the whole to the whole. Example: There are ten boys in a class with twenty-three students. So the ratio is written like this: 10:23
6. 6. Now we practice...For the snack pile in front of you write the part to whole ratios comparing:a) Cherriosb) Squaresc) Raisins
7. 7. 3. three-term ratioThis is a comparison of threequantities with the same unit.Example:There are ten boys , thirteengirls, and two teachers in ourclass.So the ratio is written likethis:
8. 8. Now we practice...For the snack pile in front of you write the three term ratio comparing all three parts of the snack.Cherrios to squares to raisins
9. 9. Question #1Write the part to part ratios comparing:a) Tennis balls to soccerballsb) Tennis balls to golf ballsc) Golf balls to soccerballs
10. 10. Question #2Write the part to whole ratios comparing:a) Tennis ballsb) Soccer ballsc) Golf balls
11. 11. Question #3Write the three-term ratiocomparing theballs in thediagram:Soccerballs totennis balls togolf balls
12. 12. Question #4(a) Using your own first name, what is the ratio comparing vowels to consonants?(b) Using your last name, what is the ratio comparing vowels to consonants?
13. 13. In your textbook pages 266-268 Complete the following questions: 1, 6, 7, 8 (a), 9, 11, 13 (a) (b) (c), 14 (a), 17 (a)