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Knowing Our Numbers CBSE Class 6

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Question 1/20

Q 1. Which of the following numbers is the smallest? 

Solution

To check the smallest number, we check if the first digit is the same, then the second digit, and so on, from left to right.

Here, the first digit is the same in all, so we check the second digit.

In 2, 2, 6, 9, the smallest number is 2, but we have the number 2 twice. Hence, we will check the third digit of 1296 and 1269, where 69 is the smallest number.

Hence, 1269 is the smallest number. 

Q 2. Which of the following numbers is the greatest number using 9, 2, 5 and 0 without repetition? 

Solution

To form the greatest number using the given numbers, we have to arrange the numbers in the descending order from left to right.

Hence, the greatest number is 9520. 

Q 3. How many lakhs make a million? 

Solution

10 lakhs = 1 million 

Q 4. Which one is the smallest among 9998, 9997, 9978, 9999?

Solution

9978 < 9997 < 9998 < 9999

Hence, 9978 is the smallest among the given numbers.

Q 5. 787 rounded to the nearest hundred is equal to 

Solution

787 rounded to the nearest hundred is equal to 800. 

Q 6. Represent the number 92 in Roman numerals. 

Solution

92 = 90 + 2 = XC + II = XCII 

Q 7. Estimate 51 × 68 to the nearest tens is equal to 

Solution

51 rounded to the nearest tens is equal to 50.

68 rounded to the nearest tens is equal to 70.Hence, 50 × 70 = 3500. 

Q 8. Commas are used to mark 

Solution

Commas are used to mark thousands, lakhs and crores. 

Q 9. Which of the following Roman numerals represents the number 19? 

Solution

A less valued Roman numeral written to the left of the greater valued Roman numeral subtracts its value from that of the greater value.

10 is denoted by X and 9 is denoted by IX. Hence, 19 is denoted by XIX. 

Q 10. The difference of 568 and 262 to the nearest ten is 

Solution

568 rounded to the nearest ten is 570.

262 rounded to the nearest ten is 260.

Hence, 570 - 260 = 310. 

Q 11. Estimate the nearest to hundred for 897 + 917. 

Solution

897 rounded to the nearest hundred is 900.

917 rounded to the nearest hundred is 900.

Hence, 900 + 900 = 1800. 

Q 12. Subtraction is not ____for whole numbers. 

Solution

Subtraction is not commutative. 

Q 13. 676 on rounding to the nearest tens is equal to 

Solution

676 on rounding to the nearest tens is equal to 680. 

Q 14. Which of the following letters is used to represent 50 in Roman numerals? 

Solution

500 is represented as D in Roman numerals. 

Q 15. Which of the following numbers is used in the international system of numeration? 

Solution

1 million is used in the international system of numeration.

Q 16. Which of the following Roman numerals can be subtracted from V and X only? 

Solution

The Roman numeral I can be subtracted from V and X only. 

Q 17. Estimate 890 - 746 rounded to the nearest ten. 

Solution

890 rounded to the nearest ten is 890.

746 rounded to the nearest ten is 750.

Hence, 890 - 750 = 140. 

Q 18. The sum of 769 and 440 to the nearest tens is 

Solution

769 rounded to the nearest tens is 770.440 rounded to the nearest tens is 440.

Hence, 770 + 440 = 1210. 

Q 19. The sum of 3567 and 6548 to the nearest tens is 

Solution

3567 rounded to the nearest tens is 3570.

6548 rounded to the nearest tens is 6550.

Hence, 3570 + 6550 = 10120. 

Q 20. Which one is the greatest among 8878, 8897, 8838, 8859?

Solution

8838 < 8859 < 8878 < 8897

Hence, 8897 is the greatest among the given numbers.

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