CBSE CLASS 7 Math Chapter 9 Rational Numbers : Practice Questions
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Practice Question's :-
Question 1...
Write each of the following rational numbers with positive denominators:
5/–8 , 15/–28 , –17/–13.
Ans: -5/8 , -15/28 , 17/13
Question 2...
Express 3/4 as a rational number with denominator:
(i) 36
(ii) – 80
Ans:
(i) 27/36
(ii) -60/-80
Question 3...
Express each of the following rational numbers in its standard form:
(i) –12/ – 30
(ii) 14/ – 49
(iii) –15/ 35
(iv) 299/ –161
Ans:
(i) 2/5
(ii) -2/7
(iii) -3/7
(iv) -13/7
Question 4...
Are the rational numbers –8/28 and 32/ –112 equivalent? Give reason.
Ans: Yes. Since standard form of -8/28 and 32/-112 is -2/7
Question 5...
Arrange the rational numbers –7/10 , 5/-8 , 2/-3 , -1/4 , -3/5 in ascending order.
Ans: -7/10 , 2/-3 , 5/-8 , -3/5 , -1/4
Question 6...
Write four more rational numbers to complete the pattern: –1/3 , –2/6 , –3/9 , ______, ______, _______, _______.
Ans: -4/12 , -5/15 , -6/18 , -7/21
Question 7...
If –5/ 7 = x/ 28 , find the value of x
Ans: (-20)
Question 8...
Find the sum of
(i) 8/13 and 3/11
(ii) 7/3 and –4/3
Ans:
(i) 127/143
(ii) 1
Question 9...
Simplify: (6/5) x (3/7) - (1/5) x (3/7)
Ans: 3/7
Question 10...
If x = 1/10 and y = –3/8 , then evaluate x + y, x – y, x × y and x ÷ y.
Ans: (-11/40 , 19/40 , -3/80 , -4/15)
Question 11...
Write the following as rational numbers in their standard forms:
(a) 35%
(b) 1.2
(c) 240 ÷ (– 840)
(d) 115 ÷ 207
Ans:
(i) 7/20
(ii) 6/5
(iii) -2/7
(iv) 5/9
Question 12...
What should be added to –1/2 to obtain the nearest natural number?
Ans: 3/2
Question 13...
What should be subtracted from –2/3 to obtain the nearest integer?
Ans: 1/3
Question 14...
What should be multiplied with –5/8 to obtain the nearest integer?
Ans: 8/5
Question 15...
What should be divided by1/2 to obtain the greatest negative integer?
Ans: (-1/2)
Chapter 9 : Rational Numbers
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