QUESTIONS ON RATIONAL NUMBERS FOR CLASS 8 WITH ANSWERS

(1) Match the following property :

(i)  

Solution

(ii)  

Solution

(iii)

Solution

(iv)  1/0               Solution

(v)  22/7          Solution

(2)  Which of the following properties hold for subtraction of rational numbers? Why?

(a) closure (b) commutative (c) associative

(d) identity (e) inverse

Solution

(3)  In a recipe making, every 1  1/2 cup of rice requires 2  3/4 cups of water. Express this, in the ratio of rice to water.             Solution

(4)  Ravi multiplied 25/8 and 16/15 to obtain 400/120. He says that the simplest form of this product is 10 3 and  Chandru says the answer in the simplest form is 3 1/3. Who is correct? (or) Are they both correct? Explain.

Solution

(5)  A piece of wire is 4/5 m long. If it is cut into 8 pieces of equal length, how long will each piece be?       Solution

(6)  Find the length of a room whose area is 153/10 sq.m and whose breadth is 2  11/20 m.          Solution

(7)  Subbu spends 1/3 of his monthly earnings on rent, 2/5 on food and 1/10 on monthly usuals. What fractional part of his earnings is left with him for other expenses?

Solution

(8)  In a constituency, 19/25 of the voters had voted for candidate A whereas 7/50 had voted for candidate B. Find the rational number of the voters who had voted for others.            Solution

(9)  If 3/4 of a box of apples weighs 3 kg and 225 gm, how much does a full box of apples weigh?       Solution

(10)  Mangalam buys a water jug of capacity 3 4/5 litres. If she buys another jug which is 2 2/3 times as large as the  smaller jug, how many litres can the larger one hold?

Solution

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