NCERT Solution Exercise 1.1
Question (1) Fill in the blanks
(a) 1 lakh = _____ ten thousand
Answer
1 lakh = Ten ten thousand
(b) 1 million = ____ hundred thousand
Answer
1 million = 1000,000 (International System of Notation)
1 million = 10,00,000 (Indian System of Notation)
1 million = Ten hundred thousand Answer
(c) 1 crore = ____ ten lakh
Answer
1 crore = 1,00,00,000 (Indian System of Notationa)
= 10 × 10,00,000
Thus, 1 crore = Ten ten lakh Answer
(d) (c) 1 crore = ____ million
Answer
1 crore = 10,000,000 (International System of Notation)
= 10 × 10,00,000
Thus, 1 crore = Ten ten lakh Answer
(e) 1 million = ____ lakh
Answer
1 million = 10,00,000 (International System of Notation)
= 10 × 1,00,000
Thus, 1 crore = Ten lakh Answer
Question (2) Place commas correctly and write the numerals:
(a) Seventy three lakh seventy five thousand three hundred seven.
Answer: 73,75,307
(b) Nine crore five lakh forty one.
Answer 9,05,041
(c) Seven crore fifty two lakh twenty one thousand three hundred two
Answer 7,52,21,302
(d) Fifty eight million four hundred twenty three thousand two hundred two
Answer
58,423,202 (International System of Notation)
5,84,23,202 (Indian System of Notation)
Number Name: Five crore eighty four lakh twenty three thousand two hundred two (Indian System of Number name)
(e) Twenty three lakh thirty thousand ten
Answer: 23,30,010
Question (3) Insert commas suitabley and write the names according to Indian System Numeration:
(a) 87595762
Answer
Number after inserting commas: 8,75,95,762
Number Name: Eight crore seventy five lakh ninety five thousand seven hundred sixty two.
(b) 8546283
Answer
Number after inserting commas: 85,46,283
Number Name: Eighty five lakh forty six thousand two hundred eighty three
(c) 99900046
Answer
Number after inserting commas: 9,99,00,046
Number Name: Nine crore ninety nine lakh forty six
(d) 98432701
Number after inserting commas: 9,84,32,701
Number Name: 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
Answer
78,921,092 (International System of Numeration.)
Number Name: Seventy eight million nine hundred twenty one thousand ninety two (International System of Numeration.)
(b) 7452283
Answer
7,452,283 (International System of Numeration.)
Number Name: Seventy million four hundred fifty two thousand two hundred eighty three (International System of Numeration.)
(c) 99985102
Answer
99,985,102 (International System of Numeration.)
Number Name: ninety nine million nine hundred eighty five thousand one hundred two (International System of Numeration.)
(d) 48049831
48,049,831 (International System of Numeration.)
Number Name: Forty eight million forty nine thousand eight hundred thirty one (International System of Numeration.)
Extra Information About Indian and International System of Numeration
Indian System of Numeration
Ones (one digit)
Tens (Two digits)
Hundreds (Three digits)
Thousands (Four digits)
Ten thousand (Five digits)
Lakh (Six digits)
Ten Lakh (Seven digits)
Crore (Eight digits)
Ten Crore (Nine digits)
Arab (Ten digits)
Ten Arab (Eleven digits)
Kharab (Twelve digits)
Ten Kharab (Thirteen digits)
Neel (Forteen digits)
Ten Neel (Fifteen digits)
Padm (Sixteen digits)
Ten Padm (Seventeen digits)
Shankh (Eighteen digits)
Ten Shankh (Nineteen digits)
Maha Shankh (Twenty digits)
International System of Numeration
Ones (One digits)
Tens (Two digits)
Thousands (Three digits)
Million (Six zeros; Seven digits)
Ten million (Seven zeros; Eight digits)
Billion (Nine zeros; Ten digits)
Ten Billion (Ten zeros; Eleven digits)
Trillion (Twelve zeros; Thirteen digits)