**Class 6 | Mathematics | Chapter 1| Knowing Our Numbers | Exercise 1.1**

**Question 1:** 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

**Question 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.

**Answer:**

(a) 73,75,307

(b) 9,05,00,041

(c) 7,52,21,302

(d) 58,423,202

(e) 23,30,010

** Question 3:** Insert commas suitable 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:** Eight-five lakh forty-six thousand two hundred eighty-three.

(c) **9,99,00,046:** Nine crore ninety-nine lakh forty-six.

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

** Question 4:**

Insert commas suitable 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 hundred twenty-one thousand ninety-two

(b) **7,452,483:** 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