# 6th Class Mental Ability Mathematical Reasoning Mathematical Operations

## Mathematical Operations

Category : 6th Class

There are four fundamental operations.

These are addition$\left( + \right)$, subtraction$\left( - \right)$, multiplication $\left( \times \right)$ and division $\left( \div \right)$

Whenever two or more of these operations occur simultaneously, we overcome on such complex situation by applying the "BODMAS" rule.

This chapter is on the basis of the "BODMAS" rule.

Let us explain this rule briefly.

B $\to$ Bracket, O $\to$ Of, D $\to$ Division, M $\to$Multiplication, A $\to$ Addition, S $\to$ Subtraction

We solve an expression first for 'bracket' (if available), then for 'of? (if available).

This process goes upto subtraction.

EXAMPLE

If 'L stands for $'+',$M' stands for $'-',$ 'N' stands for $'\times ',$ 'P' stands for' $'\div ',$ then 14 N 10 L 42 P 2 M 8 = ?

(a) 141

(b) 153

(c) 166

(d) 183

Explanation (b):

Given expression $=14\times 10+42\div 2-8=153$