# Practise Combined Operations Using a Calculator

In this worksheet, students will use a calculator to carry out more complex calculations.

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Calculators/Technology for Accuracy

Difficulty level:

#### Worksheet Overview

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

Example

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

 40 × (84.2 - 31) √ (102 + 872 )

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) =

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.

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