Questions of the form "find 80% of 20".
In order to answer this you multiply the number, 20, by the percentage over 100, 80100
20×80100=16
Remember: Give you answer to 2 decimal places.
Questions of the form "if a mixed bag of 10 sweets contains 8 mints and 2 chocolates. What percentage of the contents is chocolate"
To calculate the percentage of chocolate sweets in the bag you must divide the number of chocolates by the total number of sweets and then multiply by 100.
$\dfrac{\var{chocolate}}{\var{sweets}}\times 100 = \simplify{100*{chocolate}/{sweets}}.
Remember: Give you answer to 2 decimal places.
Questions of the form "convert 7087 into a percentage"
This question is very similar to part b). We already have the number in fractional form if we covert this into a decimal and multiply by 100% we obtain the percentage
7087=deciamal×100%=80.4597701149%
Remember: Give you answer to 2 decimal places.
Questions of the form "convert 56% into a fraction"
To do this you simply divide by 100.
56%=56100=1425
Questions of the form "Last year the average mark in an exam was 92. They have now increased by 18 percent. What is the current average mark?"
We start by finding 18 % of 92.
92×18100=16.56
We then add this onto last years average marks to find this years
92+16.56=108.56