# Numbers Percentage of a number.

## Presentation on theme: "Numbers Percentage of a number."— Presentation transcript:

Numbers Percentage of a number

Numbers We will often be asked to work out the percentage of an amount without using a calculator

We know that percent means out of 100.
Numbers We know that percent means out of 100. 1% means 1 out of 100 1% of 100 = 1

Numbers 10% of 100 = 10 So if we can work out 1% of any number, we can multiply this by the percent we need to find

Numbers If 1% of 100 is 1 1% of 200 must be 2 1% of 150 must be 1.5
How are we doing this?

We are dividing our amount by 100 1% of 750 = 750 ÷ 100 = 7.5
Numbers We are dividing our amount by 100 1% of 750 = 750 ÷ 100 = 7.5

If we know 1% of 750 is 7.5 then 2% of 750 must be 2 x 7.5 = 15
Numbers If we know 1% of 750 is 7.5 then 2% of 750 must be 2 x 7.5 = 15

Numbers What is 5% of 250? 1% of 250 is 2.5 5 x 2.5 is 12.5

Numbers It is going to take some doing to remember all of this, so lets start by getting used to working out 1% of some numbers