Class 6 Maths Knowing Our Numbers Using and Expanding Brackets

Using and Expanding Brackets

Brackets are used to avoid confusion during addition, subtraction, multiplication and division. For an arithmetic expression, first evaluate and make a single number in the brackets and then evaluate the outside part.

  1. (3 + 4) x 5 = (7) x 5 = 7 x 5 = 35

This should not be calculated as (3 + 4) x 5 = (3) + 4x5.

Brackets are expanded to evaluate individual digits inside the brackets with the digits outside.

  1. (3 + 4) x 5 = 3 x 5 + 4 x 5 = 15 + 20 = 35

Problem: Write the expressions for each of the following using brackets.

Solution:

Expression using words

Expression using numbers and brackets

Four multiplied by the sum of nine and two

4 x (9 + 2) OR (9 + 2) x 4

Divide the difference of eighteen and six by four

(18 - 6)/4

Forty Five divided by three times the sum of three and two

45 / ((3 + 2) x 3)

Share these Notes with your friends  

< Prev Next >

You can check our 5-step learning process


.