CBSE Class VI ( 6th) Mathematics Chapter 1. Knowing our Numbers : Exercise 1.1

Q1. 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.
Answer:
(a) 1 lakh = 10 ten thousand.
(b) 1 million = 10 hundred thousand.
(c) 1 crore = 10 ten lakh.
(d) 1 crore = 10 million.
(e) 1 million = 10 lakh.

Q2. 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.
Answer:
(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:58, 423, 202
(e) Twenty three lakh thirty thousand ten:23,30,010



Q3. Insert commas suitably and write the names according to Indian System of Numeration :
(a) 87595762
(b) 8546283
(c) 99900046
(d) 98432701
Answer:
(a) 8,75,95,762 : Eight crore seventy five lakh ninety five thousand seven hundred sixty two.

(b) 85,46,283 : Eighty five lakh fourty six thousand two hundred eighty three.

(c) 9,99,00,046: Nine lakh ninety nine thousand foty six.

(d) 9,84,32,701: Nine crore eighty four lakh thirty two thousand seven hundred one.

Q4. Insert commas suitably and write the names according to International System of Numeration :
(a) 78921092
(b) 7452283
(c) 99985102
(d) 48049831.
Answer:
(a) 78,921,092        Seventy-eight million,nine hindered twenty 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.