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# Class 8 - Rational Numbers Worksheet 1

1. If ab is a rational number, then b is always a whole number. Mark true/ False

a) True                     b) False

2. If c ≠ 0, then the multiplicative inverse of cd is dc. Mark true/ false.

a) True                     b) False

3. If mn is a rational number, then m is not equal to zero. Mark True / False.

a) True                     b) False

4. If tu is a rational number, and u cannot be equal to 0. Mark True / False.

a) True                     b) False

5. The population of USA in 2005-06 is a rational number. Mark True / False.

a) True                     b) False

6. If A and B are rational number then A − B = B − A. Mark True/False.

a) True                     b) False

7. 0 is a rational number. Mark True/ False.

a) True                     b) False

8. Closure property of rational number closed under Division. Mark True/ False.

a) True                     b) False

9. Infinite rational numbers are present in between two rational numbers. Mark True/False.

a) True                     b) False

10. Multiplicative identity of rational number is 0. Mark True/ False.

a) True                     b) False

11. Multiplicative inverse of a negative rational number is _____.

a) 0                   b) A positive rational number
c) 1                   d) A negative rational number

12. If 'r' is the reciprocal of rational number 's', then the reciprocal of 'r' will be _____.

a) sr                    b) s
c) rs                    d) r

13. (312 × 521)-1 = (312)-1 × _____.

a) 1312                      b) 521
c) 1162,552                d) 1521

14. Simplify 313 + 2112 × 2511.

a) 45115                   b) 152
c) 111512                 d) 1441132

15. By what rational number should -1112 be multiplied to get the product -1120.

a) 35                      b) 210
c) 312                    d) 54

16. Divide the sum of -157 and 235 by their difference.

a) -345                      b) -883
c) -535                      d) -673

17. If 23 of a number exceeds its 15 by 35, find the number.

a) 105                    b) 75
c) 80                      d) 100

18. Sita walks 135 km from a point B towards East and then from there 225 km towards west. How far will she be now from B?

a) -45 Km                  b) 45 Km
c) 155 Km                  d) 1225 Km

19. Area of a rectangular park is 8920 sq. m. If the length of the park is 314 m, find its breath.

a) 357 m                  b) 235
c) 59 m                    d) 920

20. Find the area of a square park whose one side is 345 m long.

a) 141125                  b) 21325
c) 22125                    d) 52125

Rational Numbers Worksheet - 1

Rational Numbers Worksheet - 2

Rational Numbers Worksheet - 3

Rational Numbers Worksheet - 4