# NCERT Class 6 Chapter 1

## Estimation of Numbers

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 55,923Population 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 …

## Class 6 Maths- Exercise 1.3- Question 03

(3) Estimate the following product using general rule(a.) 578 * 161 General Estimation Rule:Round off each number to its greatest place So we have to multiply 600 * 200 = 1,20,000Hence 1,20,000 is our answer b. 5281 * 3491 So now we got==> 5000 * 3000 ==> 1,50,00,000 c. 1291 * 592 Hence, according to …

## Class 6 Maths- Exercise 1.3- Question 02

(2) Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens)a. 439 + 334 + 4,317 Here we are asked to do estimation to nearest hundreds and nearest tens b. 108734 – 47,599 c. 8325 – 491 d. 4,89,348 – 48,365

## Ex 1.3- Question 01

(1) Estimate each of the following using general rulea. 730 + 998 General Estimation Rule:Round off each number to its greatest place STEP 1730 => Its a number with hundred place. So rounding off the number with hundredth digit we get 700 STEP 2998=> Again its a number wit hundredth place. So rounding off to …

## Ex 1.2, Question 09-Question 12

(9) To stitch a shirt, 2 m 15 cm cloth is needed. Out of 40 m cloth, how many shirts can be stitched and how much cloth will remain? Given: 1 Shirt can be stitched with=> 2m 15 cm cloth we know that, 1 m= 100 cm1 cm = 1/100 m1 cm =0.01 m15 cm …

## Ex 1.2, Question 05-08

(5) Find the difference between the greatest and the least 5-digit number that can be written using the digits 6, 2, 7, 4, 3 each only once We have been provided with 5 digits 6,2,7,4,3 and these digits should not be repeated.Greatest 5 digit number possible: 76432Least 5 digit number possible: 23467 Difference between greatest …

## Ex 1.2, Question 01-Question 04

(1) A book exhibition was held for four days in a school. The number of tickets sold at the counter on the first, second, third and final day was respectively 1094, 1812, 2050 and 2751. Find the total number of tickets sold on all the four days. Given:Number of tickets sold on Day 1=1094Number of …

## Ex 1.1, Question 04

Insert commas suitably and write the names according to International System of Numerationa. 78921092 Writing above number with commas7,89,21,092 Now representing number in a diagram for better representation The number can be written asSeventy Eight Million-Ninety hundred twenty one thousand-Ninety two

## EX 1.1, Question 03

Insert commas suitably and write the names according to Indian System of Numerationa. 87595762 Hence the number is==> 8,75,95,762Eight Crore Seventy Five Lakh Ninety Five Thousand Seven Hundred Sixty Two

## Ex 1.1, Question 02

Place commas correctly and write the numeralsa. Seventy Three Lakh Seventy Five Thousand Three Hundred Seven Let us create graphical slots for better understanding Now, Let us fill the number starting from the highest. So, 7378307 is the number.Now we have to put commas.Remember that commas are put to separate thousands from hundreds, Lakhs from …