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Sort out even and odd numbers: 42       ...

Sort out even and odd numbers: 42        (ii)   89          (iii)   144          (iv)   321

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Odd and Even Numbers

Cube of an odd number is even.

The square of which of the following numbers would be an odd numbers : (I)731 (ii) 3456 (iii) 5559 (iv) 42008

Write the factors of each of the following numbers: 24 (ii) 64 (iii) 144

Express each of the following odd numbers as the sum of three odd prime numbers . (i) 31, (ii) 35, (iii) 49, (iv) 63

Which of the following are the cubes of odd numbers? (i) 125 (ii) 343 (iii) 1728 (iv) 4096 (v) 9261

The squares of which of the following would be odd numbers?(i) 431 (ii) 2826 (iii) 7779 (iv) 82004

Which of the following cubes of even numbers? (i) 216 (ii) 729 (iii) 512 (iv) 3375 (v) 1000

Which of the following numbers are even and which are odd ? (i) 32, (ii) 37, (iii) 50, (iv) 58, (v) 69, (vi) 144, (vii) 321 (viii) 235

Write the following in Roman numerals: (i) 49 (ii) 69 (iii) 72 (iv) 89 (v) 98 (vi) 92

RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. Is there any natural number having no factor at all?

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

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

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  4. Find the common factors of 56 and 120.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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