GSEB Class 6 Maths Solutions Chapter 1 Knowing Our Numbers Exercise 1.1

Question 1. Fill in the blanks:
(a) 1 lakh = ............ ten thousand
(b) 1 million = ............ hundred thousand
(c) 1 crore = ............ ten lakh
(d) 1 crore = ............ million
(e) 1 million = ............ lakh
Answer:
(a) 1 lakh = 10 ten thousand. This means one lakh is equal to ten sets of ten thousand.
(b) 1 million = 10 hundred thousand. So, one million represents ten groups of one hundred thousand.
(c) 1 crore = 10 ten lakh. This shows that one crore is equivalent to ten units of ten lakh.
(d) 1 crore = 10 ten million. Thus, one crore can also be expressed as ten times ten million.
(e) 1 million = 10 lakh. Therefore, one million is the same as ten lakh.
In simple words: These blanks show how bigger numbers like a lakh, million, or crore can be written using smaller number units such as thousands or lakhs. You simply fill in the correct count.

Exam Tip: Memorize the conversion factors between different units (lakh, crore, million, thousand) to quickly solve these types of fill-in-the-blanks questions.

Question 2. Place commas correctly and write the numerals:
(a) Seventy-three lakh seventy-five thousand three hundred seven
(b) Nine crore five lakh forty-one
(c) Seven crore fifty-two lakh twenty-one thousand. three hundred two
(d) Fifty-eight million four hundred twenty-three thousand two hundred two
(e) Twenty-three lakh thirty thousand ten
Answer:
(a) Seventy-three lakh seventy-five thousand three hundred seven = 73,75,307. Here, commas are placed after lakh and thousand for easy reading.
(b) Nine crore five lakh forty-one = 9,05,00,041. In this number, the commas mark the crore and lakh places.
(c) Seven crore fifty-two lakh twenty-one thousand three hundred two = 7,52,21,302. Commas help separate the different place values clearly.
(d) Fifty-eight million four hundred twenty-three thousand two hundred two = 58,423,202. For millions, commas usually come after every three digits from the right.
(e) Twenty-three lakh thirty thousand ten = 23,30,010. The commas are placed according to the Indian numbering system.
In simple words: You need to write the numbers from the words and put commas in the right spots. This helps read large numbers more easily and accurately.

Exam Tip: Understand both the Indian and International numbering systems for placing commas. In the Indian system, it's 3, 2, 2 digits from the right, while in the International system, it's 3, 3, 3 digits from the right.

Question 3. Insert commas suitably and write the names according to Indian System of Numeration:
(a) 87595762
(b) 8546283
(c) 99900046
(d) 98432701
Answer:

Exam Tip: Remember that the Indian numbering system uses commas after the first three digits from the right, and then after every two digits (e.g., crores, lakhs, thousands). Practice writing out numbers in words to avoid mistakes.

Question 4. Insert commas suitably and write the names according to International System of Numeration:
(a) 78921092
(b) 7452283
(c) 99985102
(d) 48049831
Answer:

Exam Tip: In the International numbering system, commas are always placed after every three digits from the right, grouping them into thousands, millions, and so on. Be careful with zeros; they must be accounted for in the number name.