NCERT Solutions Class 6th Maths 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.

Solution – 

(a) 1 lakh = 10 ten thousand

(b) 1 million = 10 hundred thousand

(c) 1 crore = 10 ten lakh

(d) 1 crore = 10 million

(e) 1 million = 10 lakh

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.

Solution – 

(a) 73,75,307
(b) 9,05,00,041
(c) 7,52,21,302
(d) 5,84,23,202
(e) 23,30,010

Question 3. Insert commas suitably and write the names according to Indian System of Numeration-

(a) 87595762
(b) 8546283
(c) 99900046
(d) 98432701

Solution – 

(a) 8,75,95,762 – Eight crore seventy five lakh ninety five thousand seven hundred sixty  two

(b) 85,46,283 – Eighty five lakh forty six thousand two hundred eighty three

(c) 9,99,00,046 – Nine crore ninety nine lakh forty six

(d) 9,84,32,701 – Nine crore eighty four lakh thirty two thousand seven hundred one

Question 4. Insert commas suitably and write the names according to International System of Numeration-

(a) 78921092
(b) 7452283
(c) 99985102
(d) 48049831

Solution – 

(a) 78,921,092 – Seventy eight million nine hundred twenty one thousand ninety two

(b) 7,452,283 – Seven million four hundred fifty two thousand two hundred eightythree

(c) 99,985,102 – Ninety nine million nine hundred eighty five thousand one hundred two

(d) 48,049,831 – Forty eight million forty nine thousand eight hundred thirty one