# NCERT Solutions for Class 7 Maths Chapter 1 - Integers

Page / Exercise

## Chapter 1 - Integers Exercise 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 Exercise Ex. 1.2

Solution 1 Solution 2 Solution 3 Solution 4 ## Chapter 1 - Integers Exercise Ex. 1.3

Solution 1 Solution 2 Solution 3 Solution 4 Solution 5  Solution 6 Solution 7 Solution 8 Solution 9 ## Chapter 1 - Integers Exercise 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.

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