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Rational Numbers Book Back Questions

8th Standard EM

Reg.No. :
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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 $\left( -4\frac { 5 }{ 22 } \right)$