Percentages (%)

Percentage means parts per 100

	So 50% means 50 per 100 (50% of this box is green)
	And 25% means 25 per 100 (25% of this box is green)

Using Percentages

Because "Percent" means "per 100" you should think "this should always be divided by 100"

So 75% really means ⁷⁵/₁₀₀

And 100% is ¹⁰⁰/₁₀₀, or exactly 1 (100% of any number is just the number, unchanged)

And 200% is ²⁰⁰/₁₀₀, or exactly 2 (200% of any number is twice the number)

Use the slider on the left, and try some different numbers (example, what is 60% of 80?)


Calculate 25% of 80
25% = ²⁵/₁₀₀		(²⁵/₁₀₀) × 80 = 20
So 25% of 80 is 20


A Skateboard is reduced 25% in price in a sale. The old price was $120. Find the new price
Find 25% of $120
25% = ²⁵/₁₀₀		(²⁵/₁₀₀) × $120 = $30
25% of $120 is $30
So the reduction is $30
Take the reduction from the original price		$120 - $30 = $90
The Price of the Skateboard in the sale is $90

"Percent" comes from the latin Per Centum. The latin word Centum means 100, for example a Century is 100 years.