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C H A P T E R 4 (BODMAS)

4 . 1 B O D M A S : BODMAS BODMAS is the secret code which enables us to know exactly the right sequence of performing mathematical

operations.

What do you think is the answer to 3 + 4 x 6?

Is it (3 + 4) x 6 = 7 x 6 = 42?

OR 3 + (4 x 6) = 3 + 24 = 27?

BODMAS actually stands for

(B)rackets (O)rder (D)ivision (M)ultiplication (A)ddition (S)ubtraction

We do simplification in the same order.

Example: According to BODMAS, multiplication should always be done before addition, therefore 27 is actually the

correct answer according to BODMAS.

Here's another example to show how to use all the features of BODMAS:

Explain the answer that a calculator would give to the calculation 4 + 70/10 x (1 + 2)2 1 according to the

BODMAS rules.

Brackets give 4 + 70/10 x (3)2 1

Order gives 4 + 70/10 x 9 1

Division gives 4 + 7 x 9 1

Multiplication gives 4 + 63 1

Addition gives 67 1

Subtraction gives 66

Do you know?

In BODMAS, O stands for "order". To be more precise it signifies the "power!