# Knowing Our Numbers – Chapter 1/CBSE Class 6 MathematicsExtra Questions for Practice/Model Questions

1. Write in expanded form: 32, 09,348
Answer: 3000000 + 200000 + 9000 + 40 + 8
2. Compare and fill in the blanks with symbols <, >
a) 304521 — 340521
b) 998028 — 849280
a) 304521 < 340521 b) 998028 > 849280
3. Put comma and write the number name in Indian System of Numeration: 328509
Three lakh twenty eight thousand five hundred nine.
4. Put comma and write the number name in International system of Numeration: 45876902
Forty five million eight hundred seventy six thousand nine hundred two.
5. Round off to nearest tens, hundreds and thousands: 2568
Nearest tens: 2570
Nearest hundreds: 2600
Nearest thousands: 3000
6. Find the estimated value of 2827 + 5048
Answer: 2827 rounds off to 3000
5048 rounds off to 5000
Estimated sum = 3000 + 5000 = 8000
7. Find the estimated value of 9872 – 2845
Answer: 9872 rounds off to 10000
2845 rounds off to 3000
Estimated difference = 10000 – 3000 = 7000
8. Find the estimated value of 758 x 35
Answer: 758 rounds off to 800
35 rounds off to 40
Estimated product = 800 x 40 = 32000
9. Solve using expanding brackets: 327 x 102
Solution: 327 x (100 + 2) = 327 x 100 + 327 x 2
= 32700 + 654 = 33354
10. Write in Roman Numerals: 485
Answer: 485 = 400 + 80 + 5 = CDLXXXV