We do estimation so that calculation gets easier.

Estimation is done when you don’t require exact answer and approximate calculation is sufficient for you.

For example:

Population of City A is 55,923

Population of City B is 67,432

And we are asked to find total population of City A & B;

So we are required to calculate ==> 55,923 + 67,432

This calculation will require you to take out pen and paper for exact calculation

But in case if you need approximate answer, you should use estimation of numbers:

Closest estimate of 55,923 is ===> 56,000

Closest estimate of 67,432 is ===> 67,000

So Total Population is===> 56,000 + 67,000 ===> 1,23,000 (calculated easily)

From the above example, i hope its clear how concept of estimation is useful in practical life. Let us now understand how to do estimation.

**Estimate Nearest Tens**

**A. Estimation of number 56**

Suppose you are given number 56 and you have to find its estimation to its nearest tens**STEP 1: **Find the nearest round number present in tens places

For number 56, there are two round number present at tens places 50 and 60

**STEP 2:**

Out of 50 and 60, select the one which is nearest.

Hence for number 56, number 60 is the nearest and hence it is the best approximation for tens place

**B. Estimation of number 97 to nearest tens**

**STEP 1:**

Find the nearest round number present in tens places

For number 97, there are two round number present at tens places 90 and 100

**STEP 2:**

Out of 90 and 100, select the one which is nearest.

Hence for number 97, number 100 is the nearest and hence it is the best approximation for tens place