Ratios - Intro & How To Simplify

This lesson covers:

  1. What ratios are
  2. How to simplify ratios
  3. How to write ratios that contain more than two items

Ratios are used to compare quantities. You can simplify ratios by dividing the numbers by common factors, just like you do with fractions.

Image showing red and purple marbles for calculating the ratio between them.

What is the ratio between red and purple marbles in the image above?

:

2
3

0

/

2

A basket contains 5 apples and 9 oranges. Write down the ratio of apples to oranges.

:

5
9

0

/

2

Simplify the ratio 3 : 9

1 : 3

0

/

1

Simplify the ratio 15 : 25

3 : 5

0

/

1

Simplify the ratio 21 : 7

3 : 1

0

/

1

Simplify the ratio 6 : 18

1
3

:

1
3

0

/

2

Image showing red and purple marbles for calculating the ratio.

What is the ratio between red and purple marbles in the image above? Give your answer in its simplest form.

1 : 2

0

/

1

Image showing blue and green marbles for calculating the ratio between blue and total marbles.

What is the ratio between blue and total marbles in the image above? Give your answer in its simplest form.

4 : 7

0

/

1

Write down the ratio of 12 : 15 : 6 in its simplest form.

4 : 5 : 2

0

/

1

Write down the ratio of 12 : 24 : 20 in its simplest form

3 : 6 : 5

0

/

1