NCERT Solutions for Class 7 Maths Exercise 1.2

NCERT Solutions for Class 7 Maths Exercise 1.2 book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 7 Maths chapter wise NCERT solution for Maths Book all the chapters can be downloaded from our website and myCBSEguide mobile app for free.

NCERT solutions for Class 7 Integers Maths Download as PDF

NCERT Solutions for Class 7 Maths Integers

Class –VII Mathematics (Ex. 1.2)

Question 1.Write down a pair of integers whose:

(a) sum is {tex} – 7{/tex}

(b) difference is {tex} – 10{/tex}

(c) sum is 0

Answer:

(a) One such pair whose sum is {tex} – 7{/tex}: {tex} – 5 + \left( { – 2} \right) = – 7{/tex}

(b) One such pair whose difference is {tex} – 10{/tex}: {tex} – 2 – 8 = – 10{/tex}

(c) One such pair whose sum is 0: {tex} – 5 + 5 = 0{/tex}

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NCERT Solutions for Class 7 Maths Exercise 1.2

Question 2.(a) Write a pair of negative integers whose difference gives 8.

(b) Write a negative integer and a positive integer whose is {tex} – 5.{/tex}

(c) Write a negative integer and a positive integer whose difference is {tex} – 3.{/tex}

Answer:

(a) {tex} – 2 – \left( { – 10} \right) – 2 + 10 = 8{/tex}

(b) {tex}\left( { – 7} \right) + 2 = – 5{/tex}

(c) {tex}\left( { – 2} \right) – 1 = – 2 – 1 = – 3{/tex}

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NCERT Solutions for Class 7 Maths Exercise 1.2

Question 3.In a quiz, team A scored {tex} – 40,10,0{/tex} and team B scores 10, 0, {tex} – 40{/tex} in three successive rounds. Which team scored more? Can we say that we can add integers in any order?

Answer:

Team A scored {tex} – 40,10,0{/tex}

Total score of Team A = {tex} – 40 + 10 + 0 = – 30{/tex}

Team B scored {tex}10,0, – 40{/tex}

Total score of Team B = {tex}10 + 0 + \left( { – 40} \right) = 10 + 0 – 40 = – 30{/tex}

Thus, scores of both teams are same.

Yes, we can add integers in any order due to commutative property.

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NCERT Solutions for Class 7 Maths Exercise 1.2

Question 4.Fill in the blanks to make the following statements true:

(i){tex}\left( { – 5} \right) + \left( { – 8} \right) = \left( { – 8} \right) + \left( {…….} \right){/tex}

(ii){tex} – 53 + ……. = – 53{/tex}

(iii)17 + ……. = 0

(iv){tex}\left[ {13 + \left( { – 12} \right)} \right] + \left( {…….} \right) = 13 + \left[ {\left( { – 12} \right) + \left( { – 7} \right)} \right]{/tex}

(v){tex}\left( { – 4} \right) + \left[ {15 + \left( { – 3} \right)} \right] = \left[ { – 4 + 15} \right] + …….{/tex}

Answer:

(i) {tex}\left( { – 5} \right) + \left( { – 8} \right) = \left( { – 8} \right) + \underline {\left( { – 5} \right)} {/tex} [Commutative property]

(ii) {tex} – 53 + \underline 0 = – 53{/tex} [Zero additive property]

(iii) {tex}17 + \underline {\left( { – 17} \right)} = 0{/tex} (Additive identity]

(iv){tex}\left[ {13 + \left( {12} \right)} \right] + \underline {\left( { – 7} \right)} = 13 + \left[ {\left( { – 12} \right) + \left( { – 7} \right)} \right]{/tex} [Associative property]

{tex}\left( { – 4} \right) + \left[ {15 + \left( { – 3} \right)} \right] = \left[ { – 4 + 15} \right] + \underline {\left( { – 3} \right)} {/tex} [Associative property]

NCERT Solutions for Class 7 Maths Exercise 1.2

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