**Try These (Textbook Page No. 25)
Question $1 .$**

Round off the following numbers to the nearest ten

(i) 57

(ii) 189

(iii) 3,956

(iv) 57,312

Solution:

(i) 57

Given number $=57$

Place value to be rounded off is ten.

Digit in tens place is 5 .

Digit to'the right is $7>5$

Adding 1 to $5=1+5=6$

Changing the digits to the right of 6 to zero $=60$ rounded off number is 60 .

(ii) 189

Place value to be rounded off is ten

Digit is ten places is 8

Digit to the right is 9 > 5

Adding 1 to 8 = 1 + 8 = 9.

changing the digits to the right of 19 to zero = 190

Required rounded off number is 190

(iii) 3956

Place value to be rounded off is ten.

Digit in tens place is 5

Digit to the right is $6>5$

Adding 1 to $5=1+5=6$

Changing the right digits of 396 to zero $=3960$

Required rounded off number is 3960 .

(iv) 57312

Place value to be rounded off is ten.

Digit in tens place is 1

Digit to the right is $2<5$

Leaving the number 2 as it is changing the digits to the right of 5731 to zero $=57310$.

The rounded number is 57310

**Question 2 .**

Round off the following numbers to the nearest ten, hundred and thousand.

(i) $9,34,678$

(ii) $73,43,489$

(iii) $17,98,45,673$

Solution:

(i) $9,34,678$

Nearest Tens: $9,34,680$

Nearest Hundreds: 9,34,700

Nearest Thousands: $9,35,000$

(ii) $73,43,489$

Nearest Tens: $73,43,490$

Nearest Hundreds: $73,43,500$

Nearest Thousands: $73,43,000$

(iii) $17,98,45,673$

Nearest Tens: $17,98,45,670$

Nearest Hundreds: $17,98,45,700$

Nearest Thousands: $17,98,46,000$

**Question 3.**

The tallest mountain in the world Mount Everest, located in Nepal is 8,848 m high. Its height can be rounded

off to the nearest thousands as ______

Solution:

9000 m