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5th Class (CBSE) Mathematics: Order Of Operations

A. When you have an expression with different operations follow this order:

Division  Multiplication  Addition  Subtraction

You can remember this order as DMAS.

Following the rules.

Let us look at some examples.

a) 53 – 18 ÷ 2 x 5

= 53 – 18 ÷ 2 x 5      First divide

= 53 – 9 x 5               Next, multiply

= 53 – 45 = 8            Finally, subtract

53 – 18 ÷ 2 x 5 = 8

b) 7.5 + 7.2 ÷ 3 x 0.2

= 7.5 + 7.2 ÷ 3 x 0.2       First divide

= 7.5 + 2.4 x 0.2              Next, multiply

= 7.5 + 0.48 = 7.98         Finally, add

7.5 + 7.2 ÷ 3 x 0.2 = 7.98

DMAS

B. Sometimes, we may have an expression using the word ‘off’. You have learnt in fraction how ‘of ‘ is solved with the help of multiplication. The rule say that ‘of’ has to be solved before division.

So we can add one more operation to our rule for order of operations.

‘of’ → Division  Multiplication  Addition  Subtraction

Bodmas

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