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Find first two common multiples of 12 an...

Find first two common multiples of 12 and 18.

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
  1. Find the common factors of: (i) 5, 15 and 25            (ii) 2, 6 an...

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  2. Find first three common multiples of 6 and 8.

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  3. Find first two common multiples of 12 and 18.

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  4. A number is divisible by both 5 and 12.  By which other number will th...

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  5. A number is divisible by 24.  By what other numbers will that number b...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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