Ratios and Scale Factor

Definition: Two ratios that compare the same quantity

• Ratio

• Equivalent Ratio

• Proportion

• Variable

Definition: Two equivalent ratios that are set equal to one another

• Ratio

• Equivalent Ratio

• Proportion

• Variable

Definition: A process used to solve proportions where the numerators are multiplied by the opposite denominators

• Scale

• Distribute

• Cross-Multiply

• Scale factor

To disinfect 1 quart of stream water to make it drinkable, you need to add 2 tablets of iodine. How many tablets do you need to disinfect 4 quarts?

• 4 tablets

• 5 tablets

• 6 tablets

• 8 tablets

What is the ratio of red apples to green apples

• 7 apples to 3 green

• 4 red apples to 7 apples

• 4 red apples to 3 green apples

• 3 green apples to 4 red apples

What is the ratio of dogs to cats?

• 2:3

• 3:5

• 3:2

• 5:2

If Molly has 2 dogs for every 3 Cats...how many cats will she have if she has 6 dogs?

• 10

• 5

• 9

If there are 5 boys and 7 girls, write the ratio of girls to boys.

• 5 to 7

• 7 to 5

• 5 to 12

• 7 to 12

Ten soccer players were going to a soccer tournament with their three coaches. What is the ratio of coaches to players? 

• 10 : 3

• 10:13

• 3 : 10

• 3:13

What is B?

• 3

• 9

• 2

• 6