NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2

NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2

These NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2 Questions and Answers are prepared by our highly skilled subject experts.

NCERT Solutions for Class 7 Maths Chapter 1 Integers Exercise 1.2

Question 1:
Write down a pair of integers whose:
(a) sum is – 7
(b) difference is – 10
(c) sum is 0
Answer:
(a) – 15 and 8
sum = – 15 + 8 = – 7

(b) – 30 and – 20
Difference = – 30 – (- 20)
= -30 + 20 = – 10

(c) – 12 and + 12
Difference = – 12 + (12)
= -12 + 12 = 0

Question 2.
(a) Write a pair of negative integers whose difference gives 8.
(b) Write a negative integer and a positive integer whose sum is – 5.
(c) Write a negative integer and a positive integer whose difference is – 3.
Answer:
(a) – 13 and – 21
Difference = -13 – (- 21)
= – 13 + 21 = 8

(b) – 15 and 10
sum = – 15 + 10 = – 5
(c) – 1 and 2
Difference = – 1 – (+ 2)
= – 1 – 2 = – 3

Question 3.
In a quiz, team A scored – 40, 10, 0 and team B scored 10, 0, – 40 in three successive rounds. Which team scored more? Can we say that we can add integers in any order?
Answer:
Total score of team A = (- 40) + 10 + 0
= – 40 + 10 + 0 = – 30
Total score of team B=10 + 0 + (- 40)
= 10 + 0 – 40 = 10 – 40 = – 30
So, both the team scored equal. Yes, we can say that we can add integers in any order.

Question 4.
Fill in the blanks to make the following statements true:
(i) (- 5) + (- 8) = (- 8) + (………………)
(ii) – 53 + …………… = – 53
(iii) 17 + ……………… = 0
(iv) [13 + (- 12)] + (…………..) = 13 + [(- 12) + (- 7)]
(v) (- 4) + [15 + (- 3)] = [- 4 + 15] + …………….
Answer:
(i) (- 5) + (- 8) = (- 8) + (- 5)
(ii) – 53 + 0 = – 53
(iii) 17 + (- 17) = 0
(iv) [13 + (- 12)] + (- 7) = 13 + [(-12) + (- 7)]
(v) (-4)+ [15 +(-3)] = [-4 + 15] + (- 3)