Rational Numbers Book Back Questions

8th Standard EM

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Maths

Time : 00:45:00 Hrs
Total Marks : 30
    4 x 1 = 4
  1. Which of the following rational numbers is the greatest?

    (a)

    \(\frac { -17 }{ 24 } \)

    (b)

    \(\frac { -13 }{ 16 } \)

    (c)

    \(\frac { 7 }{ -8 } \)

    (d)

    \(\frac { -31 }{ 32 } \)

  2. \(\frac { -5 }{ 4 } \) is a rational number which lies between

    (a)

    0 and \(\frac { -5 }{ 4 } \)

    (b)

    -1 and 0

    (c)

    –1 and –2

    (d)

    –4 and –5

  3. \(\frac { 3 }{ 4 } \div \left( \frac { 5 }{ 8 } +\frac { 1 }{ 2 } \right) \)

    (a)

    \(\frac { 13 }{ 10 } \)

    (b)

    \(\frac { 2 }{ 3 } \)

    (c)

    \(\frac { 3 }{ 2 } \)

    (d)

    \(\frac { 5 }{ 8 } \)

  4. Multiplicative inverse of 0 (is)

    (a)

    0

    (b)

    1

    (c)

    -1

    (d)

    does not exist

  5. 3 x 1 = 3
  6. The value of \(\left( \frac { -15 }{ 23 } \right) \div \left( \frac { +30 }{ -46 } \right) \) is _____________

    ()

    1

  7. The multiplicative inverse of \(2\frac { 3 }{ 5 } \) is _____________

    ()

    \(\frac { 5 }{ 13 } \)

  8. If -3 x \(\frac { -6 }{ 11 } \) = \(\frac { -6 }{ 11 } \times x\) is _______________  

    ()

    -3

  9. 3 x 1 = 3
  10. The rational numbers that are equal to their additive inverses are 0 and –1.

    (a) True
    (b) False
  11. \(\frac { -7 }{ 8 } \times \frac { -23 }{ 27 } =\frac { -23 }{ 27 } \times \frac { -7 }{ 8 } \) illustrates the closure property of rational numbers

    (a) True
    (b) False
  12. Associative property is not true for subtraction of rational numbers.

    (a) True
    (b) False
  13. 4 x 2 = 8
  14. List five rational numbers between
    –1.2 and -2.3

  15. Write four rational numbers equivalent to
    \(\frac { -7 }{ 6 } \)

  16. Write four rational numbers equivalent to
    \(\frac { 8 }{ 9 } \)

  17. Find the standard form of \(\frac{27}{18}\)

  18. 4 x 3 = 12
  19. Write the following decimal numbers as rationals.
    1.15

  20. Reduce to the standard form
     \(\frac { 48 }{ -84 } \)

  21. Reduce to the standard form
    \(\frac { -18 }{ -42 } \)

  22. Subtract \(\left( -2\frac { 6 }{ 11 } \right) \) from \(\left( -4\frac { 5 }{ 22 } \right) \)

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