Chapter - 1 -EXERCISE 1.1 - Knowing our Numbers Numbers (NCERT Class 6th Maths Solution)


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/Explanation:

(A) 10 : 1 lakh = 1,00,000
= 10 × 10,000 = 10 ten thousand
(B) 10 : 1 million = 1,000,000
= 10 × 100,000 = 10 hundred thousand
(C) 10 : 1 crore = 1,00,00,000
= 10 × 10,00,000 = 10 ten lakh
(D) 10 : 1 crore = 10 million
(E) 10 : 1 million = 10 lakh

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/Explanation:

(A) 73,75,307
(B) 9,05,00,041
(C) 7,52,21,302
(D) 58,423,202
(E) 23,30,010

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

Solution/Explanation:

(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.

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

Solution/Explanation:

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 eighty-three
(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


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