Unit 3 Ratios and Proportions Study Guide

Front

What is a ratio?

Back

A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a to b' or a:b.

Front

How do you write a ratio of girls to boys if there are 7 girls and 5 boys?

Back

The ratio of girls to boys is written as 7 to 5.

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

If Jason keeps 12 pieces of gum for every 3 bags of Takis, what is the ratio of gum to Takis?

Back

The ratio of gum to Takis is 12 to 3, which simplifies to 4 to 1.

Front

How do you find the percentage of games won by a team?

Back

To find the percentage of games won, divide the number of games won by the total number of games played and multiply by 100.

Front

What is the percentage of games won if a team won 3 out of 15 games?

Back

The percentage of games won is 20%.

Front

What is the best way to compare prices of different quantities?

Back

To compare prices, calculate the unit price (price per unit) for each option.

Front

If 15 kg of tomatoes cost $32.25, what is the cost per kg?

Back

The cost per kg is $32.25 / 15 kg = $2.15 per kg.

Front

What is the missing number in the ratio table if the ratio is 76 to 90?

Back

The missing number is 76.

Front

How do you express a ratio in simplest form?

Back

To express a ratio in simplest form, divide both terms of the ratio by their greatest common divisor.