Ratios and Vocabulary Lesson 2

Warm Up

OBJECTIVE Students will use ratio language to

describe a relationship between two quantities.

Write a ratio in three ways comparing of

ducks to of pigs. Remember to simplify your

answer! 2 ducks to 1 pig 2 ducks 1

pig Fill in the blank. For every 2 ducks, there

is____ pig.

Agenda

Scaffold

Warm Up

OBJECTIVE Students will use ratio language to

describe a relationship between two quantities.

Write a ratio in three ways comparing of

ducks to of pigs. Remember to simplify your

answer! 2 ducks to 1 pig 2 ducks 1

pig Fill in the blank. For every 2 ducks, there

is____ pig.

1) a fraction

2) the word, to

3) a colon

Agenda

Scaffold

Agenda

OBJECTIVE Students will use ratio language to

describe a relationship between two quantities.

1) Warm Up (Independent)

2) Launch

- If the World Was a Village Video (Independent)

- Follow-up Questions (Partner Work)

3) Explore

- Mini Lesson (Whole Class and Partner Work)

-Challenge (Partner Work)

4) Practice (Partner Work, Whole Class)

5) Summary (Whole Class)

6) Assessment (Independent)

Launch

We will practice writing ratios by watching a

video on the world.

- Turn and Talk
- What country were you born in?
- What languages do you speak?
- Be ready to share with class!

Agenda

Launch

We will practice writing ratios by watching a

video on the world. This video pretends that

there is a village of 100 people who equally

represent every country and language in the

world. Watch the If the World Were a Village

Video and answer questions 1-14.

Agenda

Launch Continued

Please check your answers!

Agenda

Mini Lesson

- Lets answer this question together
- How can we write a ratio using words?
- (ex ) For every 100 people in the village, there

are 61 people from China. - SUPER important term for writing ratios
- For every can be used to replace the fraction

bar, colon or word to in a ratio - For each can also be used to replace the

fraction bar, colon or word to in a ratio

Agenda

Explore

- For every and for each can be used to replace

the fraction bar, colon or word to in a ratio - (ex 1) Write a ratio in words comparing beaks to

wings for an eagle. - Step 1 Write a ratio of beaks to wings
- 1 beak 2 wings
- Step 2 Write this ratio in words
- An eagle has

We can also say, An eagle has 2 wings for each

beak.

Why does beak not have a letter s at the end?

There is only 1 beak so we do not need to make

the word plural.

We use for each when we only have 1 thing being

compared, like 1 beak!

Agenda

Explore

We can also start sentences with for every, lets

try! (ex 2) In a class election, Juan received

20 votes and Kevin received 8

votes. Write a ratio in words comparing Juan and

Kevins votes. Step 1 Write a ratio of Juans

votes to Kevins votes 20 Juans votes

to 8 Kevins votes Step 2 Simplify the

ratio 5 Juans votes to 2 Kevins

votes Step 3 Write this ratio in words For

every, 5 votes that Juan received Kevin

received 2 votes.

Did you simplify the ratio? Lets add a new step!

Are the ratios 20 to 8 the same as 5 to

2?

Yes! 20 to 8 and 5 to 2 equivalent fractions or

equal fractions!

Agenda

Explore Try with a Partner

(ex 3) Kaylee buys 2 posters that are the same

size. She wants to hang up each poster using

the following push pins. Write a sentence

using for each to answer the question. How many

push pins should she use for each poster? Step

1 Write a ratio of push pins to posters 8 push

pins 2 posters Step 2 Simplify the ratio 4

push pins 1 poster Step 3 Write this ratio

in words Kaylee needs 4 push pins for each

poster. For each, poster, Kaylee needs 4 push

pins.

Agenda

Challenge Try with a Partner

(ex 4) Brian also wants to decorate his room.

He has 6 posters that need the same ratio of push

pins as Kaylees Posters. How many push pins

does Brian need to hang up his posters? - Draw

a picture and explain your steps!

Agenda

Challenge Try with a Partner

(ex 4) Brian also wants to decorate his room.

He has 6 posters that need the same ratio of push

pins as Kaylees Posters. How many push pins

does Brian need to hang up his posters? - Draw

a picture and explain your steps!

Explanation Since we have 4 posters and each

poster needs 4 push pins, we know that Brian

needs at total of 16 push pins.

Fancy Algebra Way

Agenda

Practice

You have 5 minutes to work with your partners on

this class work, good luck!

Agenda

Practice - Answers

Agenda

Summary

We can use the phrase, for every, to help us

write ratios as sentences! Turn and

Talk (ex) Calvin told his friend that his cat

has 2 tails for every 1 ear. Is he right? Why

or why not? Calvin is wrong. He should have

said that his cat has 2 ears for every 1 tail.

If Calvin was right then he has a cat with 1 ear

and 2 tails, ek!

Agenda

Assessment

- For 1 and 2, fill in the blanks
- 1) We can write ratios as sentences using the

phrase, - _______ _________ .
- A human being has ____ fingers for every _____

nose. - A brownie recipe calls for 3 cups of white sugar,

2 cups of - brown sugar and 1 cup of flour. Write a sentence

comparing - cups of flour to cups of brown sugar.
- 1 cup of flour 2 cups of brown sugar
- A brownie recipe has 1 cup of flour for every
- 2 cups of brown sugar.

Agenda