(?) a = 12, b = – 4, c = 2

(b) a = (-10), b = 1, c = 1

Answer :

a ÷ (b + c) \(\neq \)(a ÷ b) + (a ÷ c)

(a) If a = 12, b = – 4, c = 2

Then L.H.S.= 12÷{(-4)+2} = 12÷ (-2)= -6

R.H.S.= {12÷(-4)}+(12÷2) = (-3)+ 6 = 3

Hense L.H.S.\(\neq \)R.HS verified

(b) If a = (-10), b = 1, c = 1

Then L.H.S.= (-10)÷(1+1)= -10÷ 2 = -5

R.H.S.= {(-10)÷1}+{(-10)÷1}= (-10)+(-10) =-20

Hense L.H.S.\(\neq \)R.HS verified

- Q.1 Evaluate each of the following: (a) (-30) ÷ 10 (b) 50 ÷ (-5) (c) (-36) ÷ (-9) (d) (-49) ÷ (49) (e) 13 ÷ [(-2) + 1] (f) 0 ÷ (-12) (g) (-31) ÷ [(-30) + (-1)] (h) [(-36) ÷ 12] ÷ 3 (i) [(-6) + 5] ÷ [(-2) + 1]
- Q.3 Fill in the blanks: (a) 369 ÷ ___ = 369 (b) (-75) ÷ ___ = -1 (c) (-206) ÷ ___ =1 (d) -87 ÷ ___ = -87 (e) ___ ÷ 1 = -87 (f) _____ ÷ 48 = –1<br (g) 20 ÷ ___ = -2
- Q.4 Write five pairs of integers (a, b) such that a ÷ b = -3. One such pair is (6, -2) because 6 + (-2) = -3.
- Q.5 The temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero? What would be the temperature at midnight?
- Q.6 In a class test (+3) marks are given for every correct answer and (-2) marks are given for every incorrect answer and no marks for not attempting any question: (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (ii) Mohini scores -5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?
- Q.7 An elevator descends into a nine shaft at the rate of 6 m/min. If the descent starts from 10 m above the ground level, how long will it take to reach -350 m.

- NCERT solutions for class 7 maths chapter 1 Integers
- NCERT solutions for class 7 maths chapter 2 Fractions and Decimals
- NCERT solutions for class 7 maths chapter 3 Data Handling
- NCERT solutions for class 7 maths chapter 4 Simple Equations
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- NCERT solutions for class 7 maths chapter 6 The Triangle and its Properties
- NCERT solutions for class 7 maths chapter 7 Congruence of Triangles
- NCERT solutions for class 7 maths chapter 8 Comparing Quantities
- NCERT solutions for class 7 maths chapter 9 Rational Numbers
- NCERT solutions for class 7 maths chapter 10 Practical Geometry
- NCERT solutions for class 7 maths chapter 11 Perimeter and Area
- NCERT solutions for class 7 maths chapter 12 Algebraic Expressions
- NCERT solutions for class 7 maths chapter 13 Exponents and Powers
- NCERT solutions for class 7 maths chapter 14 Symmetry
- NCERT solutions for class 7 maths chapter 15 Visualising Solid Shapes

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- NCERT solutions for class 7 science chapter 2 Nutrition In Animals
- NCERT solutions for class 7 science chapter 3 Fibre to Fabric
- NCERT solutions for class 7 science chapter 4 Heat
- NCERT solutions for class 7 science chapter 5 Acids Bases and Salts
- NCERT solutions for class 7 science chapter 6 Physical and Chemical Changes
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- NCERT solutions for class 7 science chapter 8 Winds, Storms and Cyclones
- NCERT solutions for class 7 science chapter 9 soil
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- NCERT solutions for class 7 science chapter 13 Motion and Time
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- NCERT solutions for class 7 science chapter 15 Light
- NCERT solutions for class 7 science chapter 16 Water: A Precious Resource
- NCERT solutions for class 7 science chapter 17 Forests: Our Lifeline
- NCERT solutions for class 7 science chapter 18 Waste Water Story