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How to calculate percentages easily topic cover

How to calculate percentages easily

In mathematics, a percentage is a number or ratio expressed as a fraction of 100.

Example and Solution

Percent means per 100 so your should devided by 100. So 50% means half (50100), 100% means all (100100). These are example and how to calculating percentage.

How to calculate percentage of a number example

Example : 20% of 250 oranges are bad. How many orangess are bad?

  • 20% = 20100
  • 20% of 250 oranges = 20100 x 250
  • 20% of 250 oranges = 5000100
  • So answer is 50 oranges are bad

How to calculate percentage of one number to another example

Example : If only 25 of the 250 apples are bad, what percent is that?

  • As a fraction : 25250 = 0.10
  • As a percentage : 25250 x 100 = 10%
  • So answer is 10% of oranges are bad

How to calculate a value from the percentage part example

Example : the sale price of a smartphone normally priced at $320 that has been reduced by 20%.

  • Find 20% of $320 : 20100 x $320 = $64
  • Sale price of smartphone is $320 - $64 = $256
Another way is :
  • 100% (full price) - 20% (discount) = 80% (discounted price)
  • Then multiplied by the original price : 0.80 x 320 = 256