Q-1: Fill in the blanks:
(a) 1 lakh = ………….. ten thousand.
(b) 1 million = ………… hundred thousand.
(c) 1 crore = ………… ten lakhs.
(d) 1 crore = ………… million.
(e) 1 million = ………… lakhs.
Solution:
(a) 1 lakh = ………….. ten thousand.
1 lakh = 1,00,000 = 10 ten thousand
Detailed Explanation:
1 lakh = 1,00,000
ten thousand = 10,000
$1,00,000 \div10,000 = 10$
$\therefore$ 1 lakh = 10 ten thousand
(b) 1 million = ………… hundred thousand.
1 million = 10,00,000 = 10 hundred thousand
Detailed Explanation:
1 million = 10,00,000
hundred thousand = 1,00,000
$10,00,000\div 1,00,000 = 10$
$\therefore$ 1 million = 10 hundred thousand
(c) 1 crore = ………… ten lakhs.
1 crore = 1,00,00,000 = 10 ten lakhs
Detailed Explanation
1 crore = 1,00,00,000
ten lakhs = 10,00,000
$1,00,00,000\div 10,00,000 = 10$
$\therefore$ 1 crore = 10 ten lakhs
(d) 1 crore = ………… million.
1 crore = 1,00,00,000 = 10 miliion
Detailed Explanation:
1 crore = 1,00,00,000
million = 10,00,000
$1,00,00,000 \div 10,00,000 = 10$
1 crore = 10 million
(e) 1 million = ………… lakhs.
1 million = 10,00,000 = 10 lakhs
Q-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) Seventy three lakh seventy five thousand three hundred seven
73,75,307
(b) Nine crore five lakh forty one
9,05,00,041
(c) Seven crore fifty two lakh twenty one thousand three hundred two
7,52,21,302
(d) Fifty eight million four hundred twenty three thousand two hundred two
5,84,23,202
(e) Twenty three lakh thirty thousand ten
23,30,010
Q-3: Insert commas suitably and write the names according to the Indian System of Numeration:
(a) 87595762
(b) 8546283
(c) 99900046
(d) 98432701
Solution:
(a) 87595762
8,75,95,762 – Eight crore seventy five lakh ninety five thousand seven hundred sixty two
(b) 8546283
85,46,283 – Eighty five lakh forty six thousand two hundred eighty three
(c) 99900046
9,99,00,046 – Nine crore ninety nine lakh forty six
(d) 98432701
9,84,32,701 – Nine crore eighty four lakh thirty two thousand seven hundred one
Q-4: Insert commas suitably and write the names according to the International System of Numeration:
(a) 78921092
(b) 7452283
(c) 99985102
(d) 48049831
Solution:
(a) 78921092
78,921,092 – Seventy eight million nine hundred twenty one thousand ninety two
(b) 7452283
7,452,283 – Seven million four hundred fifty-two thousand two hundred eighty three
(c) 99985102
99,985,102 – Ninety-nine million nine hundred eighty five thousand one hundred two
(d) 48049831
48,049,831 – Forty-eight million forty-nine thousand eight hundred thirty-one
