Pace Work

13/04/2020

8 form

Тема: Відсотки

One percent (1%) means 1 per 100.

1% of this line is shaded green: it is very small isn't it?

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

 

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

Examples:

		100% means all. Example: 100% of 80 is 100100 × 80 = 80
		50% means half. Example: 50% of 80 is 50100 × 80 = 40
		5% means 5/100ths. Example: 5% of 80 is 5100 × 80 = 4

Using Percent

When 100% =

then:

75% = 60

Use the slider and try some different numbers
(What is 40% of 80? What is 10% of 200? What is 90% of 10?)

Because "Percent" means "per 100" think:

"this should be divided by 100"

So 75% really means 75100

And 100% is 100100, or exactly 1 (100% of any number is just the number, unchanged)

And 200% is 200100, or exactly 2 (200% of any number is twice the number)

A Percent can also be expressed as a Decimal or a Fraction

A Half can be written...       As a percentage: 50% As a decimal: 0,5 As a fraction: 1/2

Read more about this at Decimals, Fractions and Percentages.

Some Worked Examples

Example: Calculate 25% of 80

25% = 25100

And  25100 × 80 = 20

So 25% of 80 is 20