Intro to Ratios and Proportions

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:b'.

Front

How do you write a ratio?

Back

Ratios can be written in three ways: using a colon (a:b), as a fraction (a/b), or with the word 'to' (a to b).

Front

What is a proportion?

Back

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

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Front

What is the missing number in the ratio 3:5 = x:15?

Back

x = 9.

Front

If there are 4 red apples and 3 green apples, what is the ratio of red apples to green apples?

Back

The ratio is 4:3.

Front

What is the ratio of triangles to squares if there are 4 triangles and 6 squares?

Back

The ratio is 2:3.

Front

How many students are in each class if there are 88 students in 4 classes?

Back

22 students per class.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

If the ratio of boys to girls in a class is 3:2, how many girls are there if there are 12 boys?

Back

There are 8 girls.