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Which of the following numbers are divis...

Which of the following numbers are divisible by 21? 21063             (ii)   20163

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RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. Write first five multiples of each of the following numbers: 25    ...

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  2. Which of the following numbers have as their factor 15 ...

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  3. Which of the following numbers are divisible by 21? 21063          ...

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  4. Without actual division show that 11 is a factor of each of the fol...

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  5. Without actual division show that each of the following numbers is d...

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  6. Is there any natural number having no factor at all?

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  7. Find numbers between 1 and 100 having exactly three factors.

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  8. Sort out even and odd numbers: 42        (ii)   89          (iii)  ...

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  9. Find the common factors of 56 and 120.

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

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

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

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

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  14. Find the common factors of: 5, 15 and 25            (ii)  2, 6 and 8

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

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

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

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

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  19. Which of the following numbers are prime numbers: 179          (...

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

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