NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2

# NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2

## NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2

NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2 are the part of NCERT Solutions for Class 7 Maths. Here you can find the NCERT Solutions for Class 7 Maths Chapter 1 Integers Ex 1.2.

### Ex 1.2 Class 7 Maths Question 1.

Write down a pair of integers whose:
(a) sum is -7
(b) difference is -10
(c) sum is 0

Solution.
(a) A pair of integers whose sum is -7 can be (-2) and (-5). Answers may vary.
(-2) + (-5) = -7
(b) A pair of integers whose difference is -10 can be (-13) and (-3). Answers may vary.
-13 (-3) = -13 + 3 = -10
(c) A pair of integers whose sum is 0 can be 5 and (-5). Answers may vary.
(-5) + (5) = 0

### Ex 1.2 Class 7 Maths 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.

Solution.
(a) A pair of negative integers whose difference gives 8 can be -2 and -10. Answers may vary.
(-2) (-10) = -2 + 10 = 8
(b) A negative integer and a positive integer whose sum is -5 can be -10 and 5. Answers may vary.
(-10) + 5 = -10 + 5 = -5
(c) A negative integer and a positive integer whose difference is -3 can be -2 and 1. Answers may vary.
(-2) 1 = 2 – 1 = -3

### Ex 1.2 Class 7 Maths 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?

Solution.
Total score of team A = (-40) + 10 + 0
= -40 + 10 + 0 = -30
Total score of team B = 10 + 0 + (-40)
= 10 + 0 – 40 = -30
Since, the total score of each team is equal.
No team scored more than the other but each team has equal score.
Yes, we can add integers in any order and the result remains the same. For example, (-40) + 10 + 0 = -30 = 10 + 0 + (-40)

### Ex 1.2 Class 7 Maths 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] + …..…

Solution.
(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)

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