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Which of the following numbers is prime?...

Which of the following numbers is prime? (a) 23         (b)  51      (c)  38      (d)  26

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
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  2. The ratio of two numbers is 3:4 and their HCF is 4. Their LCM is (a...

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  3. Which of the following numbers is prime? (a) 23         (b)  51     ...

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  4. Which of the following numbers are twin primes? (a) 3, 5          ...

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  5. What smallest digit be written in the blank space of the number .......

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  6. Which of the following numbers is divisible by 6? (a) 1258     (b)...

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  7. Which of the following numbers is divisible by 11? (a) 7138965      ...

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  8. Which of the following numbers is a perfect number? (a) 12       ...

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  9. Which of the following numbers is not divisible by 4? (a) 78536     ...

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  10. The smallest prime just greater than the HCF of 84 and 144 is (a) 1...

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  11. Every counting number has an infinite number of (a )factors           ...

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  12. What least number should be replaced by * so that the number 37610*2...

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  13. Define a perfect number. Write two perfect numbers.

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  14. Make a list of seven consecutive numbers, none of which is prime.

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  15. The HCF of two numbers is 23 and their product is 55545. Find their...

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  16. Find the smallest 5-digit number which is exactly divisible by 20, ...

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  17. Find the largest number which divides 615 and 963 leaving remainder...

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  18. The length, breadth and height of a room are 1050 cm, 750cm and 425...

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  19. Find the greatest number of four digits which is exactly divisible ...

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  20. Reduce (289)/(391) to the lowest terms

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