Ncert Solutions For Class 7 Maths Ex 1.2

Ncert Solutions For Class 7 Maths Chapter 1 Ex 1.2

Question 1:

Write down a pair of integers in which:

i) sum is -6

Answer:-5 + (-1) = -6

 

ii) difference is -8

Answer:-9 – (-1) = -8

 

iii) sum is 1

Answer: 5 + (-4) = 1

 

Question 2:

i) Write a pair of negative integers whose difference gives 7.

Answer: (-2) – (-9) = -2 + 9 = 7

 

ii) Write a negative integer and a positive integer whose sum is -6.

Answer: (-7) + 1 = -6

 

iii) Write a negative integer and a positive integer whose difference is -7.

Answer: (-4) – 3 = -4 – 3 = =7

 

Question 3:

A quiz was held in which team A scored -35, 12, 0 and team B scored 12, 8, -30 in three successive rounds. Who won the quiz by scoring more marks? Can the integers be added in any manner?

Answer:                                 

Score of Team A = -35, 12, 0

Total score = -35 + 12 + 0 = -23

Score of Team B = 12, 8, -30

Total score = 12 + 8 + (-30) = -10

As -10 > -30, Team B won.

Yes, the integers can be added in any manner.

 

Question 4:

Fill in the blanks.

i) (-4) + (-6) = (-6) + (__)

ii) -34 + ______ = -34

iii) 18 + _____ = 0

iv) [14 + (-11)] + (___) = 14 + [(-11) + (-9)]

Answer:

i) (-4) + (-6) = (-6) +(-5)[Commutative property]

ii) -34 +0= -34 [Zero additive property]

iii) 18 + (-18) = 0                                                                  [Additive identity]

iv) [14 + (-11)] + (-9) = 14 + [(-11) +(-9)][Associative property]

 

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