NCERT Solutions for Class 7 Maths Chapter 1 - Integers

Page / Exercise

Chapter 1 - Integers Ex. 1.1

Solution 1
Solution 2
Solution 3
Solution 4
Solution 5
Solution 6
Solution 7
Solution 8
Solution 9
Solution 10

Chapter 1 - Integers Ex. 1.2

Solution 1
Solution 2
Solution 3
Solution 4

Chapter 1 - Integers Ex. 1.3

Solution 1
Solution 2
Solution 3
Solution 4
Solution 5

Solution 6
Solution 7
Solution 8
Solution 9

Chapter 1 - Integers Ex. 1.4

Solution 1
Solution 2
Solution 3
Solution 4
Solution 5
Solution 6

Marks obtained for 1 right answer = + 3

Marks obtained for 1 wrong answer = - 2

(i) Marks scored by Radhika = 20

Marks obtained for 12 correct answer = 12 × 3 = 36

Marks obtained for incorrect answers = Total score - Marks obtained for 12 correct answers

   = 20 - 36

  = - 16

Marks obtained for 1 wrong answer = - 2

Thus, number of incorrect answers = (- 16) ÷ (- 2) = 8

So, she attempted 8 questions wrongly.

 

(ii) Marks scored by Mohini = - 5 

Marks obtained for 7 correct answers = 7 × 3 = 21

Marks obtained for incorrect answers = Total score - Marks obtained for 12 correct answers

 = - 5 - 21

  = - 26 

Marks obtained for 1 wrong answer = - 2

Thus, number of incorrect answers = (- 26) ¸ (- 2) = 13

So, she attempted 13 questions wrongly.

Solution 7