# Knowing Our Numbers – Chapter 1/Extra Questions for Practice.

**CBSE CLASS 6 MATHEMATICS**

**Knowing Our Numbers – Chapter1**

**Extra Questions for Practice – Short Answer Type Questions**

**Answer the following questions (2 marks):**

**1. Put commas suitably and write the number name in International System of Numeration: 70002509.**

**2. Write the smallest and greatest 5 digit numbers having 4 in the hundreds place, without repeating any digit.**

**3. Find the product of smallest 3 digit number and greatest 4 digit number?**

**4. Estimate **

**i) 423 + 789 to the nearest tens.**

**ii) 852 – 689 to the nearest hundreds.**

**5. Write the numeral for:**

**i) Nine crore eight lakh five hundred.**

**ii) Seven million six hundred thirty three thousand four hundred fifteen.**

**6. Find the difference between the greatest and smallest 4 digit number that can be written using the digits 6, 2, 7, 3 each only once.**

**7. How many hundred thousand makes one million?**

**8. Write the following in Roman Numerals:**

**i) 94**

**ii) 198**

**9. Give the Hindu-Arabic numeral for:**

**i) XCVIII**

**ii) XLIII**

**10. Find the difference between the place value and face value of 8 in 7894.**

**ANSWERS:**

1. 70,002,509.

Number name: Seventy million two thousand five hundred nine.

2. Smallest number is 10423 and greatest number is 98476.

3. Smallest 3 digit number is 100 and greatest 4 digit number is 9999.

Product = 9999 x 100 = 999900.

4. i) 423 rounds off to 420.

789 rounds off to 790.

Estimated sum = 420 + 790 = 1210.

ii) 852 rounds off to 900.

689 rounds off to 700.

Estimated difference = 900 – 700 = 200.

5. i) 9,08,00,500

ii) 7,633,415.

6. Greatest 4 digit number is 9999 and smallest 4 digit number is 1000.

Difference = 9999 – 1000 = 8999.

7. 10 hundred thousand makes one million.

8. i) 94 = XCIV

ii) 198 = CXCVIII.

9. i) 98

ii) 43

10. Place value of 8 in 7894 is 800 and face value of 8 is 8 itself.

Difference = 800 – 8 = 792.