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What are prime numbers? List all primes ...

What are prime numbers? List all primes between 1 and 30.

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
  1. A number is divisible by 24.  By what other numbers will that number b...

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  2. Which of the following numbers are prime numbers: (i) 179          ...

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  3. What are prime numbers? List all primes between 1 and 30.

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  4. Write all prime numbers between: (i) 70 and 90   (ii) 40 and 85

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  5. What is the smallest prime number? Is it an even number?

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  6. What is the smallest odd prime? Is every odd number a prime number?...

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  7. What are composite numbers? Can a composite number be odd? If yes, ...

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  8. What are the twin-primes? Write all pairs of twin prime between 1 and ...

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  9. What are co-primes? Give examples of five pairs of co-primes. Are co...

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  10. Which of the following pairs are always co-primes? (i) two ...

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  11. Express each of the following as a sum of two or more primes: (i) 1...

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  12. Express each of the following numbers as the sum of two odd primes: ...

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  13. Express each of the following numbers as the sum of twin primes: (i...

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  14. Find the possible missing twins for the following numbers so that th...

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  15. A list consists of the following pairs of numbers: 51, 53; 55,57; 59...

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  16. For a number, greater than 10, to be prime what may be the possible di...

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  17. Write seven consecutive composite numbers less than 100 so that the...

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  18. State true (T) or false (F): The sum of primes cannot be a prime. The ...

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  19. Fill in the blanks in the following: A number having only two factors ...

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  20. Factorize 234 into prime factors.

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