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Home > Maths I > Numbers and Money > Percentages

Maths I

Percentages

Expressing one quantity as a percentage of another

This means working out the percentage.

Example

15 out of 30 pupils in a class are girls. Express this as a percentage.

 

{15 \over 30} \times 100 \% = 50 \%

 

Try the question below. Make sure you do the examples on paper before you check the answers.

 

Question

A new healthy snack bar called "Fibre-crunch" is being sold in the shops. Each bar weighs 40g and contains 2g of protein, 3g of fat and 35g of carbohydrate. What percentage of protein, fat and carbohydrate does "Fibre-crunch" contain?

Answer
  • Percentage protein

    = {2 \over 40} \times 100 \%

     

  • = 5%

  •  

  • Percentage fat

    = {3 \over 40} \times 100 \%

  •  

  • = 7.5%

  •  

  • Percentage carbohydrate

    = {35 \over 40} \times 100 \%

  •  

  • = 87.5%

Watch

Crowd at a football stadium.

Class Clips

Video clip about how percentages are used to manage football fans in a stadium

Watch

A woman shopping a supermarket.

Class Clips

Video clip about how percentage change in prices through inflation affects consumers

Play

A picture of Mia Cadaver

Tombstone Timeout

Swot up your sums with Mia Cadaver's maths game

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