B O D M A S means as under. This is used when we simplify the expressions.

B = Brackets

O = Of

D = Division

M = Multiplication

A = Addition

S = Subtraction

When an expression is to be simplified, first we have to remove the **Brackets**.

By simplifying the expression within the brackets**, **then secondly **Of** means we have to do the operations like 1/4th of or 20% of etc.

Then we have to do the **Divisions** in the expression.

Then we have to do the **Multiplications** in that expression

Then we have to do the **Additions** and **Subtractions** in the last to arrive at the correct answer. So to remember which to do first and which then, we have to remember the word **BODMAS**.