Percentages of a quantity

1
Percentages of a quantity

• Without a calculator

Percent means per 100 10 therefore means 10
out of 100 written as This means in order to
find 10 of a quantity we simply divide by
10 Example 10 of 50
2
Example Work out 20 of 500   Example Work out
30 of 140   Example Work out 15 of 350
3
Example Work out 45 of 330cm   Example Work
out 17½ of 150   Example Work out 21 of 270
4
Example Work out 36 of 185km   Example Work
out 98 of 3400   Example What is 25 of 144cm?
5

• Example
• The price of a new television is 176 plus VAT at
  17½.
• Work out the VAT to be added to the price of the
  television.
• What is the total cost of the television?

6
Example The number of girls attending football
matches is expected to increase by 3 this year.
If there where 12500 girls attending matches last
year, how many girls are expected to attend this
year?