Practise Combined Operations Using a Calculator

This activity is about carrying out complex calculations on a calculator.

Example

Use your calculator to work out the following to one decimal place:

Answer

Type the following carefully into your calculator:

40 x ( 84.2 - 31 ) ÷  √ ( 10 ^ 2 + 87 ^ 2 ) =

or

40 x ( 84.2 - 31 ) ÷  √ ( 10 x²  + 87 x²) =

This gives the answer 24.29977513

We round this off to one decimal place to give the answer 24.3

Calculators aren't all the same, so if you get a different answer when following the steps above, try doing the √  part of the calculation last.