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Class 7 NCERT Solutions Maths Chapter 1 - Integers

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


Integers Exercise Ex. 1.2

Solution 1

Solution 2

Solution 3

Solution 4

Integers Exercise Ex. 1.3

Solution 1

Solution 2

Solution 3

Solution 4

Solution 5


Solution 6

Solution 7

Solution 8

Solution 9

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.

Solution 7

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