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Do all the factors of a given number div...

Do all the factors of a given number divide the number exactly? Find the factors of 28 and verify by division.

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NCERT TELUGU-PLAYING WITH NUMBERA-EXERCISE
  1. Find the smallest number that has to be subtracted from 256, so that i...

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  2. Find the factors of 80.

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  3. Do all the factors of a given number divide the number exactly? Find t...

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  4. 3 is a factor of 15 and 24. Is 3 is a factor of their difference also?

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  5. What is the smallest prime number?

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  6. What is the smallest composite number?

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  7. What is the smallest odd composite number?

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  8. Give 5 odd and 5 even composite numbers?

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  9. Is 1 prime or composite and why?

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  10. Can you guess a prime number which when on reverseing its digits, give...

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  11. You know 311 is a prime number, Can you find the other two prime numbe...

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  12. From the following numbers identify different pairs of co-primes. 2, 3...

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  13. Write all the factors of the following numbers. 36,

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  14. Write all the factors of the following numbers23

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  15. Write all the factors of the following numbers 96

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  16. Write all the factors of the following numbers 115

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  17. Which of the following pairs are co-prime? (i)18 and 35, (ii) 216 and ...

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  18. Which of the following pairs are co-prime? (¡) 30 and 415, (ii) 17 and...

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  19. What is the greatest prime number between 1 and 20?

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  20. Find the prime and composite numbers between 10 and 30?

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