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Knowing Our Numbers CBSE Class 6

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Question 1/20

Q 1. The place value of 5 in 6584 is

Solution

The place value of 5 in 6584 is 500.

Q 2. The sum of 156 and 87 to the nearest hundreds is 

Solution

156 rounded to the nearest hundred is 200.

87 is rounded to the nearest hundred.

Hence, 200 + 100 = 300. 

Q 3. Subtraction and division are not 

Solution

Subtraction and division are neither commutative nor associative. 

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. Commas are used to mark 

Solution

Commas are used to mark thousands, lakhs and crores. 

Q 6. _____ distinct 3-digit numbers can be formed using the digits 3, 2, 8 once without repetition.

Solution

6 distinct 3-digit numbers (i.e. 328, 382, 283, 238, 832, 823) can be formed using the digits 3, 2, 8 once without repetition.

Q 7. Estimate the nearest to thousand for 1874 + 2452. 

Solution

1874 rounded to the nearest thousand is 2000.

2452 rounded to the nearest thousand is 2000.

Hence, 2000 + 2000 = 4000. 

Q 8. 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 9. Estimate 942 × 745 rounded to the nearest hundred. 

Solution

942 rounded to the nearest hundred is 900.

745 rounded to the nearest hundred is 700.

Hence, 900 × 700 = 630000. 

Q 10. Represent the number 92 in Roman numerals. 

Solution

92 = 90 + 2 = XC + II = XCII 

Q 11. 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 12. Which of the following numbers has no Roman numeral? 

Solution

There is no Roman numeral for zero. 

Q 13. 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 14. 676 on rounding to the nearest hundred is equal to 

Solution

676 on rounding to the nearest hundred is 700. 

Q 15. Estimate 125 × 297. 

Solution

125 rounded to the nearest hundred is 100.

297 rounded to the nearest hundred is 300.

Hence, 100 × 300 = 30000. 

Q 16. A number divided by zero is 

Solution

A number divided by zero is not defined. 

Q 17. How many lakhs make a million? 

Solution

10 lakhs = 1 million 

Q 18. Which of the following numbers is not used in the international system of numeration? 

Solution

10 thousand is used in the Indian system of numeration. 

Q 19. Which of the following is used in the Indian numeration system? 

Solution

Thousand, lakh and crore are used in the Indian numeration system. 

Q 20. 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. 

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