Exercise 1.1 – Knowing Our Numbers
1. Fill in the blanks:
(a) \(1\ \text{lakh} = \; \underline{10} \; \text{ten thousand}.\)
(b) \(1\ \text{million} = \; \underline{10} \; \text{hundred thousand}.\)
(c) \(1\ \text{crore} = \; \underline{10} \; \text{ten lakh}.\)
(d) \(1\ \text{crore} = \; \underline{10} \; \text{million}.\)
(e) \(1\ \text{million} = \; \underline{10} \; \text{lakh}.\)
Answer: All blanks = 10.
2. Place commas correctly and write the numerals:
(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
Answer: Numerals written as above.
3. Insert commas suitably and write the names according to the Indian System of Numeration:
(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
Answer: Names written in Indian system.
4. Insert commas suitably and write the names according to the International System of Numeration:
(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
Answer: Names written in International system.