The rule of order of operations is called as BIDMAS.

**Order
of Operations**

**Think about the situation**

Valli and her four friends went to a butter milk
shop. Each had a cup of butter milk and paid ₹ 30, assuming that the cost of one
cup of butter milk to be ₹ 6. But the shop keeper told that the cost of butter milk
had increased by ₹ 2. Then, Valli decided to give ₹ 2 more and paid ₹ 32. But the shop keeper claimed that she had to pay ₹ 40.
Who is correct?

The amount ₹ 40 claimed by the Shop keeper is correct. This
confusion can be avoided by using the brackets in the correct places like 5 × (6
+ 2).

The rule of order of operations is
called as BIDMAS.

Now, we try to solve 9 + 5 × 2 by using BIDMAS,

9 + (5 × 2) = 9 + 10

= 19

__Example 1.9__

Simplify: 24 + 2 × 8 ÷ 2 + 1

**Solution**

24 + 2 × 8 ÷ 2 − 1 (given question)

= 24 + 2 × 4 − 1 (÷ operation, completed first)

= 24 + 8 – 1 (×
operation, completed second)

= 32 − 1 (+ operation, completed third)

= 31 (− operation , completed last)

__Example 1.10__

Simplify: 20 + [8 × 2 + {6 × 3 − 10 ÷
5}]

**Solution**

20 + [8 × 2 + { − 10 ÷
5}] (given question)

= 20 + [8 × 2 + {18 – 10 ÷ 5}] (bar
completed first)

= 20 + [8 × 2 + {18 − 2}] ( ÷ completed second )

= 20 + [8 × 2 + 16] ({ } completed third)

= 20 + [16 + 16] (× completed fourth)

= 20 + 32 ([ ] operation completed fifth)

**= 52 ( + completed
last) **

Tags : Numbers | Term 1 Chapter 1 | 6th Maths , 6th Maths : Term 1 Unit 1 : Numbers

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6th Maths : Term 1 Unit 1 : Numbers : Order of Operations | Numbers | Term 1 Chapter 1 | 6th Maths

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