lesson #2 - intro to ratios

8/11/2019 Lesson #2 - Intro to Ratios

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RATIOS, UNIT RATES &

PROPORTIONSVan Siclen Community Middle School

Grade 6 Math

Class 602/603/604/605

Mr. E

September 12, 2014


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WWW.TINYURL/COM/VSCMATH36

Todays Lesson Link!


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DO NOW6 MINUTES

Look at the figure on the right. What isthe area (in tiles)? What is the perimeter(in toothpicks)? Are there twice as manytoothpicks than tiles? Explain.

Mr. E says that if there were 18toothpicks in this figure, there would betwice as many toothpicks than tiles. Ishe correct? Explain.


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LESSON OVE

Yesterday, we continued to practice

area and perimeter using toothpicks

and tiles. Today we will begin to learn

about ratios.


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RATIOSBASICS

In math, a ratio is a relationship or comparison

between two numbers or two things. This is

expressed as (for example) a to b OR a:b.

For example: There are 3 green circles and 4

orange circles on the right. The ratio of green

circles to orange circles is 3 to 4.

Ratios can be written in 3 ways. We can write:

3 to 4or

3:4or

What is orange green cthis ratio


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4 M

Look at the picture on the right.What is the ratio of red squares toblue squares? Write this ratio in 3ways. What is the ratio of bluesquares to red squares? Write thisratio in 3 ways.

Look at the picture on the right.What is the ratio of yellow circles togreen circles? Write this ratio in 3ways. What is the ratio of greencircles to yellow circles? Write thisratio in 3 ways.

Mr. Eare tbluesquaor in

Mr. Eare amanthanhe c

inco

TRY IT!4 MINUTES


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RATIOS BASICS 5 MINUTES

Ratios can also come in the form of word problems.Look at the following problem:

VSC Middle school has 5 times as many students asthere are teachers. Complete the ratio table below:

Teachers Students

1 5

2 10

3

5

7

9

- If the

teacmanthere

- If theteacmanthere

- If theteacmanthere


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RATIOS BASICS 5 MINUTES

Can we find the number of teachers if we know howmany students there are?

VSC Middle school has 5 times as many students asthere are teachers. Complete the ratio table below:

Teachers Students

1 5

2 10

3

5

7

9

- If stmth

- If st

mth

- 40mth


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HOMEWORK #4 DUE MONDAY SEPTEMBE

VSC Middle School has twice as many girls than boys.

Complete the ratio table below Answer the questions below and to the right.

Boys Girls

10

12

15

36

40

44

- If we are given the number of girls, can we find the number of boys? Whoperation should we use?

- How many boys attend VSC if there are 1,000 girls?

On the bawrite the r

girls for earatio tableLine 1 :

10 to ____10 : ______10/

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lesson #2 - intro to ratios

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