A ratio shows the relative sizes of two or more values.

Ratios can be shown in different ways:

• using the ":" to separate example values

• using the "/" to separate one value from the total

• as a decimal, after dividing one value by the total

• as a percentage, after dividing one value by the total

Example: if there is 1 boy and 3 girls you could write the ratio as:

1:3 (for every one boy there are 3 girls)

1/4 are boys and 3/4 are girls

0.25 are boys (by dividing 1 by 4)

25% are boys (0.25 as a percentage)