Posted by Peter on 18th June 2009

Maths Worksheet: Order of Calculating (Bodmas) 2

order-of-calculating-2The acronym BODMAS
Brackets
Of
Division
Multiplication
Addition
Subtraction.
It is a convention to ensure everyone carries out a question such as that below in the same order. Numbers in brackets are worked out first, followed by multiplication and division with addition and subtraction last.

3 + 5 x 2 =

One way to do the question is:       3 + 5 = 8.  8 x 2 = 16.
It can also be done like this:           5 x 2 = 10. 10 + 3 = 13.

If you use a calculator and key in 3 + 5 x 2 you might get 16 or 13, it depends on the type of calculator you use (simple of scientific). So which is ‘correct’?
Answer: 13
So with 3 + 5 x 2, the first thing to do is 5 x 2, then add the 3.

To make this easier we often put brackets round parts of the question, to make it clearer, like this:
3 + ( 5 x 2 )
Primary children might not be introduced to the term BODMAS but they should be working in the correct order.

Order of calculating (Bodmas) pg 2

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