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Find the common factors of 4, 8 and 12....

Find the common factors of 4, 8 and 12.

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
  1. Sort out even and odd numbers: (i)42        (ii)89          (iii)...

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  2. Find the common factors of 56 and 120.

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  3. Find the common factors of 4, 8 and 12.

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

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

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  6. Find the common factors of: (i)15 and 25       (ii) 35 and 50

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  7. Find the common factors of: (i) 5, 15 and 25            (ii) 2, 6 an...

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

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

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

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

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

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

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

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

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

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

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

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

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

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