Year 8 Interactive Maths - Second Edition

Expressing One Quantity as a Percentage of Another Quantity

Example 8

I obtained 40 marks out of 60 in a test.  Convert this test mark to a percentage.  Round your answer to the nearest per cent.

Solution:

So, the percentage test mark is 67%.

Note:

Write 40 as a fraction of 60.  Then multiply it by 100%.

Example 9

What percentage of $5 is 42¢?

Solution:

Note:

To express one quantity as a percentage of another, we must have both quantities in the same units.