Rational Numbers Ex. 1.2

Rational Numbers Class 8 ICSE Questions along with Answers :- (So these are useful for practice irrespective of the book that is followed in your school)(Exercises from ML Agarwal book)

 ML Agarwal Class 8 Solutions for ICSE Maths Chapter 1 Rational Numbers

                       Ex 1.2

Question 1.
Subtract:

Solution:

Question 2.
Sum of two rational numbers is 35. If one of them is −27, find the other.
Solution:
Sum of two rational numbers = 35
One number = −27

Question 3.
What rational number should be added to −511 to get −78?
Solution:
Sum of two numbers = −78
One number = −511

Question 4.
What rational number should be subtracted from -435 to get -312 ?
Solution:

Question 5.
Subtract the sum of −57 and −83 from the sum of 52 and −1112.
Solution:

Question 6.
If x = −47 and y = 25, then verify that x – y ≠ y – x.
Solution:

Question 7.
If x = 49, y = −712 and z = −23, then verify that x – (y – z) ≠ (x – y) – z
Solution:

Question 8.
Which of the following statement is true/fasle?
(i) 23−45 is not a rational number.
(ii) −57 is the additive inverse of 57.
(iii) 0 is the additive inverse of its own.
(iv) Commutative property holds for subtraction of rational numbers.
(v) Associative property does not hold for subtraction of rational numbers.
(vi) 0 is the identity element for subtraction of rational numbers.
Solution:
(i) 23−45 is not a rational number. (False)
Correct:
10−1215 = −215
It is a rational number.
(ii) −57 is the additive inverse of 57. (True)
(iii) 0 is the additive inverse of its own. (True)
(iv) Commutative property holds for subtraction of rational numbers. (False)

(v) Associative property does not hold for subtraction of rational numbers. (True)
(vi) 0 is the identity element for subtraction of rational numbers. (False)