Ratios and Equivalent Ratios

Ratios and Equivalent Ratios

Carby: Grade 8

Remember ..

Ratios are just comparing things. You have to look at what is given to you and write your findings as a ratio or fraction.

Multiple Choice

What is a ratio?

• A number over another number

• Multiplying two fractions

• Two decimals that are multiplied

• A comparison of two numbers

Multiple Choice

What is the ratio of stars to circles?

• stars/circles = 11/5
• stars/circles = 5/11
• circles/stars = 5/11

Multiple Choice

Which of the following options is a real life example of a ratio?

• 12 noodles
• 4 meatballs : 1 cup of sauce
• 1 jar of sauce
• 15 desserts

Press play to listen to instructions!

Multiple Choice

A cookie recipe calls for 3 cups of flour and 2 cups of chocolate chips. What is the ratio of chocolate chips to flour?

• 3 : 2

• 3 to 2

• 6 : 4

• 2 : 3

Multiple Choice

There are 6 red dots, 3 green dots, and 5 orange dots. What is the ratio of green dots to orange dots?

• 5:3
• 3:5
• 6:3
• 5:6

Equivalent Ratios

Remember that you can re-write ratios as fractions. Once they are a fraction, you can find something equivalent by either MULTIPLYING or DIVIDING.

Equivalent Ratios

You can use both multiplying and dividing to find equivalent ratios.

If you are multiplying your ratio will get BIGGER, if you are dividing your ratio will get SMALLER.

Multiple Select

How do you find equivalent ratios?

• Multiplying both sides of the ratio

• Dividing both sides of the ratio

• adding both sides of the ratio

• subtracting both sides of the ratio

Multiple Choice

Thinking of equivalent ratios, 1 : 4 is equal to:

• 2 : 9

• 4 : 16

• 6 : 26

• 8 : 40

Multiple Choice

Find one equivalent ratio for 15 : 30 using division

• 7 : 15

• 5 : 10

• 3 : 5

Multiple Select

Find two equivalent ratios for 3 : 4 using multiplication

• 6 : 8

• 6 : 12

• 9 : 12

Multiple Choice

Joe has 11 Playstation 4 games and 13 Nintendo games. What is the ratio of PS4 games to Nintendo games?

• 5:7

• 1 to 3

• 13/11

• 11/13

Multiple Choice

63 : 21 = _ : 3

• 7

• 8

• 9

• 10

Multiple Choice

In the equivalent ratios below, what did we multiply by to get the ratio on the bottom?

9 : 4

45 : 20

• 6

• 5

• 8

• 3

Multiple Choice

Are 14 : 18 and 7 : 9 equivalent ratios?

• Yes

• No

Multiple Choice

Are 4 : 5 and 8 : 15 equivalent ratios?

• Yes

• No

Multiple Choice

Are 1 : 2 and 2 : 4 equivalent ratios?

• Yes

• No

Multiple Choice

Find one equivalent ratio for 5 : 8 using multiplication

• 10 : 24

• 15 : 24

• 15 : 16

Multiple Choice

$15 for 5 pairs of socks; $25 for 10 pairs of socks

• yes, equivalent

• no, not equivalent

Multiple Choice

Enrique is making cakes.

Based on the table, how many eggs will Enrique need to make 7 cakes?

• 11

• 28

• 32

• 40

Multiple Choice

In the fruit bowl there are 4 apples, 2 bananas, and 5 pears. What is the ratio of pears to ALL fruit?

• 5:4

• 5:11

• 2:5

• 6:5

Multiple Choice

For a recipe, George uses 4 cups of sugar for every 5 cups of flour. Which of the following show equivalent ratios for sugar to flour?

• 4/5=8/10 =12/15

• 4/5 = 5/6 = 6/7

• 4/5 = 3/4 = 2/3

• 4/5=8/15=16/45

Poll

I understand how to find equivalent ratios

• Definitely, I could get 100% on a test!

• Yeah, I pretty much get it

• Nooo! I need help :(

Poll

Did you like this type of lesson?

• yes

• meh.. no

Poll

Should I make more lessons in this style?

• Yes!! :)

• No :(