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)