Class : 6th
Subject : Mathematics
Chapter : 1 (Knowing Our Number)
Exercise : 1.1
1. Fill in the blanks :
(a) 1 lakh = ___ ten thousand.
(b) 1 million = ___ hundred thousand.
(c) 1 crore = ___ ten lakh.
(d) 1 core = ___ million.
(e) 1 million = ___ lakh
Solution :
(a) 1 lakh = 10 ten thousand
= 1,00,000
(b) 1 million = 10 hundred thousand
= 10,00,000
(c) 1 crore = 10 ten lakh
= 1,00,00,000
(d) 1 core = 10 million
= 1,00,00,000
(e) 1 million = 10 lakh
= 1,000,000
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) 73,75,302
(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 :
(a) Eight crore seventy five lakh ninety five thousand seven hundred sixty two.
(b) Eighty five lakh forty six thousand two hundred eighty three.
(c) Nine crore ninety nine lakh forty six.
(d) 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 :
(a) Seventy eight million nine hundred twenty one thousand ninety two.
(b) Seven million four hundred fifty two thousand two hundred eighty three.
(c) Ninety nine million nine hundred eighty five thousand one hundred two.
(d) Forty eight million forty nine thousand eight hundred thirty one