NCERT Class 6 Solutions: Knowing Your Numbers (Chapter 1) Exercise 1.1 – Part 2

Q-2 Place commas correctly and write the numerals:

  1. Seventy–three lakh seventy–five thousand three hundred seven.

  2. Nine crore five lakh forty–one.

  3. Seven crore fifty–two lakh twenty–one thousand three hundred two.

  4. Fifty–eight million four hundred twenty–three thousand two hundred two.

  5. Twenty–three lakh thirty thousand ten.

Solution:

Refer the following table to understand the how commas are placed in the Indian system English system of numbering. After 1000 a comma is placed every 2 digits in Indian system; in English system a comma is placed every 3 digits.

Table explaining the relationship between Indian and International system of numbering
Table comparing the Indian and International system and numbering with appropriate use of commas

Hindi

Indian figure

Powernotation

International figure

International Names

one

1

100

1

One

ten

10

101

10

Ten

one hundred

100

102

100

One hundred

one thousand

1,000

103

1,000

One thousand

ten thousand

10,000

104

10,000

Ten thousand

one lakh (also lac)

1,00,000

105

100,000

One hundred thousand

ten lakh

10,00,000

106

1,000,000

One million

one crore

1,00,00,000

107

10,000,000

Ten million

ten crore

10,00,00,000

108

100,000,000

One hundred million

one arab or one hundred crore

1,00,00,00,000

109

1,000,000,000

One billion

ten arab

10,00,00,00,000

1010

10,000,000,000

Ten billion

one kharab

1,00,00,00,00,000

1011

100,000,000,000

One hundred billion

ten kharab

10,00,00,00,00,000

1012

1,000,000,000,000

One trillion

one neel

1,00,00,00,00,00,000

1013

10,000,000,000,000

Ten trillion

ten neel

10,00,00,00,00,00,000

1014

100,000,000,000,000

One hundred trillion

one padm

1,00,00,00,00,00,00,000

1015

1,000,000,000,000,000

One quadrillion

ten padm

10,00,00,00,00,00,00,000

1016

10,000,000,000,000,000

Ten quadrillion

one shankh

1,00,00,00,00,00,00,00,000

1017

100,000,000,000,000,000

One hundred quadrillion

ten shankh

10,00,00,00,00,00,00,00,000

1018

1,000,000,000,000,000,000

One quintillion

  1. Seventy–three lakh seventy–five thousand three hundred seven.

    Place commas correctly in Seventy–three lakh seventy–five thousand three hundred seven and write the numerals

    Place Commas in 7375307 Written in Words

    Place commas correctly in Seventy–three lakh seventy–five thousand three hundred seven and write the numerals

    70,00,000+3,00,000+70,000+5,000+300+0+7=73,75,307

  2. Nine crore five lakh forty–one.

    Place commas correctly in nine crore five lakh forty-one and write the numerals

    Place Commas Correctly of Nine Crore Five Lakh Forty-One

    Place commas correctly in nine crore five lakh forty-one and write the numerals

    9,00,00,000+00,00,000+5,00,000+00,000+0,000+000+40+7=9,05,00,041

  3. Seven crore fifty–two lakh twenty–one thousand three hundred two

    Place commas correctly in seven crore fifty-two lakh twenty- one thousand three hundred two and write the numerals

    Place Commas in 75221302 Written in Words

    Place commas correctly in seven crore fifty-two lakh twenty- one thousand three hundred two and write the numerals

    7,00,00,000+50,00,000+2,00,000+20,000+1,000+300+0+2=7,52,21,302

  4. Fifty–eight million four hundred twenty–three thousand two hundred two

    Place commas correctly in Fifty–eight million four hundred twenty–three thousand two hundred two and write the numerals

    Place Commas in 58423202 Written in Words

    Place commas correctly in Fifty–eight million four hundred twenty–three thousand two hundred two and write the numerals

    5,00,00,000+80,00,000+4,00,000+20,000+3,000+200+0+2=5,84,23,202

  5. Twenty–three lakh thirty thousand ten.

    Place commas correctly in twenty–three lakh thirty thousand ten and write the numerals

    Place Commas in 2330010 Written in Words

    Place commas correctly in twenty–three lakh thirty thousand ten and write the numerals

    20,00,000+3,00,000+30,000+0+0+10+0=23,30,010

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