Class 6 Maths – Chapter 1: Knowing Our Numbers
Important Questions and Solutions
1. Write the number name for 7,63,945 in the Indian number system.
Solution: Seven lakh sixty-three thousand nine hundred forty-five.
2. Write 45,332,786 in the International system of numeration.
Solution: Forty-five million, three hundred thirty-two thousand, seven hundred eighty-six.
3. Estimate the sum of 4,323 and 6,789 to the nearest hundred.
Solution: 4,300 + 6,800 = 11,100.
4. Find the difference between 8,76,234 and 5,43,876.
Solution: 8,76,234 – 5,43,876 = 3,32,358.
5. Round off 5,431 to the nearest ten.
Solution: 5,430.
6. Write the greatest 5-digit number using the digits 6, 2, 7, 9, and 3 without repeating any digit.
Solution: 97,632.
7. Find the product of the largest 3-digit number and the smallest 2-digit number.
Solution: 999 × 10 = 9,990.
8. Using the digits 4, 1, 8, and 3, form the smallest 4-digit number.
Solution: 1,348.
9. Round off 34,578 to the nearest thousand.
Solution: 35,000.
10. Write the expanded form of 23,451.
Solution: 20,000 + 3,000 + 400 + 50 + 1.
11. What is the successor of 5,98,999?
Solution: 5,99,000.
12. What is the predecessor of 1,00,000?
Solution: 99,999.
13. Estimate the product of 345 × 67 by rounding to the nearest tens.
Solution: 350 × 70 = 24,500.
14. Find the place value of 7 in the number 5,74,321.
Solution: 70,000.
15. Write the Roman numeral for 54.
Solution: LIV.
16. Write the largest 4-digit number using the digits 5, 9, 2, and 8.
Solution: 9,852.
17. Write 1,00,000 in words in the Indian number system.
Solution: One lakh.
18. Find the smallest 5-digit number divisible by 3.
Solution: 10,002.
19. Round off 87,653 to the nearest hundred.
Solution: 87,700.
20. How many thousands are there in 5,00,000?
Solution: 500 thousands.
21. Multiply the smallest 4-digit number by 12.
Solution: 1,000 × 12 = 12,000.
22. Find the difference between the place values of 7 and 5 in the number 57,623.
Solution: Place value of 7 = 7,000; Place value of 5 = 50,000; Difference = 50,000 – 7,000 = 43,000.
23. Write the smallest 3-digit number divisible by 9.
Solution: 108.
24. What is the place value of 5 in 5,21,384?
Solution: 5,00,000.
25. Round off 15,674 to the nearest tens.
Solution: 15,670.
26. What is the sum of the smallest 4-digit number and the largest 3-digit number?
Solution: 1,000 + 999 = 1,999.
27. Express 10,000 as a power of 10.
Solution: 104.
28. Find the product of the greatest 4-digit number and the smallest 1-digit number.
Solution: 9,999 × 1 = 9,999.
29. Write the number name for 1,05,204.
Solution: One lakh five thousand two hundred four.
30. Estimate the difference between 9,876 and 4,321 to the nearest hundred.
Solution: 9,900 – 4,300 = 5,600.
31. How
many lakhs are there in 12,34,567?
Solution: 12 lakhs.
32. Find the sum of 23,456 and 34,567.
Solution: 58,023.
33. Write the expanded form of 9,87,654.
Solution: 9,00,000 + 80,000 + 7,000 + 600 + 50 + 4.
34. What is the successor of 2,99,999?
Solution: 3,00,000.
35. What is the predecessor of 10,00,000?
Solution: 9,99,999.
36. Write the smallest 5-digit number using the digits 2, 5, 0, 9, and 1.
Solution: 10,025.
37. Round off 1,23,456 to the nearest thousand.
Solution: 1,23,000.
38. How many digits are there in the number 1,00,000?
Solution: 6 digits.
39. What is the difference between the largest 3-digit number and the smallest 3-digit number?
Solution: 999 – 100 = 899.
40. Write the number in expanded form: 76,543.
Solution: 70,000 + 6,000 + 500 + 40 + 3.
41. Write the greatest 5-digit number.
Solution: 99,999.
42. Find the smallest number formed by the digits 3, 2, 5, and 7.
Solution: 2,357.
43. Round off 8,99,999 to the nearest lakh.
Solution: 9,00,000.
44. What is the place value of 6 in 2,36,584?
Solution: 6,000.
45. Write the number 12,34,567 in words.
Solution: Twelve lakh thirty-four thousand five hundred sixty-seven.
46. How many hundreds are there in 5,00,000?
Solution: 5,000 hundreds.
47. Write the number 5,87,234 in the International system of numeration.
Solution: Five hundred eighty-seven thousand two hundred thirty-four.
48. Find the sum of 1,00,000 and 45,678.
Solution: 1,45,678.
49. Round off 7,45,678 to the nearest ten thousand.
Solution: 7,50,000.
50. Write the number name for 1,23,456 in the Indian number system.
Solution: One lakh twenty-three thousand four hundred fifty-six.
51. Convert 5 kilometers into meters.
Solution: 5 km = 5000 meters.
52. Convert 300 centimeters into meters.
Solution: 300 cm = 3 meters.
53. How many grams are there in 3 kilograms?
Solution: 3 kg = 3000 grams.
54. Convert 12 liters into milliliters.
Solution: 12 liters = 12,000 milliliters.
55. How many days are there in 3 weeks?
Solution: 3 weeks = 21 days.
56. Convert 2.5 hours into minutes.
Solution: 2.5 hours = 150 minutes.
57. How many millimeters are there in 1 meter?
Solution: 1 meter = 1000 millimeters.
58. Convert 15 kilograms into grams.
Solution: 15 kg = 15,000 grams.
59. How many hours are there in 2 days?
Solution: 2 days = 48 hours.
60. Convert 50 milliliters into liters.
Solution: 50 ml = 0.05 liters.
61. How many centimeters are there in 2.5 meters?
Solution: 2.5 m = 250 cm.
62. Convert 8 weeks into days.
Solution: 8 weeks = 56 days.
63. Convert 4,500 milliliters into liters.
Solution: 4,500 ml = 4.5 liters.
64. How many seconds are there in 5 minutes?
Solution: 5 minutes = 300 seconds.
65. Convert 9 liters into milliliters.
Solution: 9 liters = 9,000 milliliters.
66. How many grams are there in 2.5 kilograms?
Solution: 2.5 kg = 2500 grams.
67. Convert 600 centimeters into meters.
Solution: 600 cm = 6 meters.
68. How many millimeters are there in 4.5 meters?
Solution: 4.5 m = 4500 mm.
69. Convert 2500 milliliters into liters.
Solution: 2500 ml = 2.5 liters.
70. How many weeks are there in 30 days?
Solution: 30 days = 4 weeks and 2 days.
