Understanding BODMAS, BIDMAS or BEDMAS (order of operations).
BODMAS, BIDMAS and BEDMAS all help you to carry out operations in the correct order. For younger students it is a good idea to start off with BODMAS:
Once a student has studied powers (which are also called indices or exponents) then use BIDMAS:
or use BEDMAS:
Powers are the little numbers that sit on the top right of a number (squares, cubes...)
Basically, if you are given a calculation you always work out what’s inside the brackets first, then do powers, then do division, then do multiplication, then do addition and finally do subtraction.
Let’s take a look at some examples that involve using BODMAS, BIDMAS or BEDMAS.
7 × (6 – 2)
First do what’s inside the brackets, as brackets is above multiplication in the words BODMAS, BIDMAS or BEDMAS. So:
7 × 4
9 + 6 × 3
First do the multiplication, as multiplication before addition in the words BODMAS, BIDMAS or BEDMAS.
9 + 18
90 – 30 ÷ 6
First do the division, as division comes first in the words BODMAS, BIDMAS or BEDMAS.
90 – 5
4 × 3²
First calculate 3², as powers come before multiplication in the word BODMAS, BIDMAS or BEDMAS.
4 × 9
Put a bracket in the correct place to make this calculation correct:
11 – 7 × 2 + 6 = 14
The bracket need to do go around the 11-7 as the subtraction needs to be carried out first, to make the calculation correct:
(11 – 7) × 2 + 6
Now let’s check to see if this gives 14.
First do the brackets, as brackets come first in the words BODMAS, BIDMAS or BEDMAS.
This gives 4 × 2 + 6.
Next do multiplication as this comes next in the words BODMAS, BIDMAS or BEDMAS.
This gives 8 + 6, which gives an answer of 14.
More by this Author
The density, mass and volume triangle is as follows: So if you wanted to work out the density, you would cover up density in the magic triangle to give: Density = Mass/Volume (since mass is above volume) So if...
The surface area of a triangular prism can be found in the same way as any other type of prism. All you need to do is calculate the total area of all of the faces. A triangular prism has 5 faces, 3 being rectangular and...
A compound shape is a shape that is made up from other simple shapes. In this article we will be working out the area of a L shape (made up from 2 rectangles). To find the area of a compound shape, follow these simple...