NCERT Solutions
Class 7
Maths
Chapter 4 Simple Equations

NCERT Solutions Class 7 Maths Chapter 4 Simple Equations

The NCERT solution for Class 7 Maths Chapter "Simple Equations" helps students learn how to formulate and solve equations. This chapter introduces the process of converting word problems into mathematical expressions, which is crucial for developing a solid mathematical foundation.

Simple equations are particularly useful in real-life situations. For example, they can be applied when budgeting to determine how much money remains after expenses, for age-related problems, or even in cooking to adjust ingredient quantities based on recipe proportions. The NCERT textbook provides clear explanations of each concept, but to truly strengthen your understanding, practising questions from the NCERT solutions is essential.

Overall, equations provide a structured way to analyze and solve real-life situations effectively. We have provided detailed information on their importance and a downloadable PDF below, so you can freely access the NCERT Solutions for Class 7 Maths Chapter 4: Simple Equations.

1.0Importance of Practice NCERT Solutions Class 7 Maths Chapter 4 Simple Equations

  • The concepts presented in Chapter 4 of the NCERT Solutions for Class 7 Maths offer an initial basis for enhancing the mathematical skills needed for examinations.
  • The exercises and examples in the NCERT solutions on simple equations simplify complex concepts and make them easy to understand. 
  • The exercise questions cover the basics, formulas, and principles of simple equations, which helps students understand how to solve problems.
  • The abilities students gain from preparing this chapter enable them to handle increasingly complex problems in the future, which is essential for upcoming exams.  

2.0Download Class 7 Maths Chapter 4 NCERT Solutions PDF Online

You can download the Class 7 Maths Chapter 4 NCERT Solutions in PDF format. The exercises provide step-by-step explanations that give the student a thorough understanding of the material. The solutions have been created in accordance with the most recent CBSE guidelines to ensure that students are well-prepared for their exams.

NCERT Solutions Class 7 Maths Chapter 4: Simple Equations

3.0Subtopics Covered Under Class 7 Maths Chapter 4 Simple Equations

The subtopics in Chapter 4 give students a general overview of simple equations and give them the skills and information they need to use the concept successfully. The table below provides a brief overview of these subtopics.

4.1: A Mind-Reading Game!

This section introduces the concept of variables, explaining how they represent unknown values in equations and setting the foundation for algebraic thinking.

4.2: Setting Up of an Equation

Students learn to translate word problems into mathematical equations, developing the ability to express real-world situations in algebraic form.

4.3: Review of What We Know

This part focuses on the techniques for solving simple equations, guiding students through the steps to isolate the variable and find its value.

4.4: What Equation Is?

Here, students discover how simple equations can be applied to solve practical problems, reinforcing the relevance of algebra in everyday life.

4.5: More Equations

The chapter includes a variety of practice exercises that allow students to apply their knowledge, test their understanding, and gain confidence in solving simple equations.

4.0All Excercise of NCERT Solutions Class 7 Maths Chapter 4 Simple Equations

Chapter 4, Simple Equations, exercises are listed below, along with the total number of questions that are part of the NCERT solutions:

Class 7 Maths Chapter 4 Ex 4.1

6 Questions

Class 7 Maths Chapter 4 Exercise 4.2

4 Questions

Class 7 Maths Chapter 4 Exercise 4.3

4 Questions

Class 7 Maths Chapter 4 Exercise 4.4

4 Questions


5.0NCERT Questions with Solutions for Class 7 Maths Chapter 4 - Detailed Solutions

Exercise: 4.1

  • Complete the last column of the table.
S. No.EquationValueSay, whether the equation is satisfied. (Yes / No)
[i]
[iv]
[vii]

Sol.

S. No.EquationValueSay, whether the equation is satisfied. (Yes / No)
[i]No
[ii]No
Yes
No
Yes
No
vii]Yes
viii No
No
No
Yes
  • Check whether the value given in the brackets is a solution to the given equation or not: (a) (b) (c) (d) (e) (f) Sol. (a) Putting in L.H.S., L.H.S. R.H.S., is not the solution of the given equation. (b) Putting in L.H.S., L.H.S. R.H.S., is not the solution of the given equation. (c) Putting in L.H.S., L.H.S. R.H.S., is the solution of the given equation. (d) Putting in L.H.S., L.H.S. R.H.S., is not the solution of the given equation. (e) Putting in L.H.S., L.H.S. R.H.S., is not the solution of the given equation. (f) Putting in L.H.S., L.H.S. R.H.S., is not the solution of the given equation. 3
  • Solve the following equations by trial and error method: (i) (ii) Sol. (i) Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. 5(0) Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. , Therefore, is the solution. (ii) Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. 3(0) Therefore, is not the solution. Putting L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is not the solution. Putting in L.H.S. Therefore, is the solution.
  • Write equations for the following statements: (i) The sum of numbers and 4 is 9 . (ii) 2 subtracted from y is 8 . (iii) Ten times a is 70 . (iv) The number b divided by 5 gives 6 . (v) Three-fourth of t is 15 . (vi) Seven times m plus 7 gets you 77 . (vii) One-fourth of a number x minus 4 gives 4 . (viii) If you take away 6 from 6 times , you get 60. (ix) If you add 3 to one-third of , you get 30 . Sol. (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) Sol. (i) The sum of numbers p and 4 is 15 . (ii) 7 subtracted from is 3 . (iii) Two times is 7 . (iv) The number is divided by 5 gives 3 . (v) Three-fifth of the number is 6 . (vi) Three times p plus 4 gets 25 . (vii) If you take away 2 from 4 times , you get 18. (viii) If you added 2 to half of , you get 8 .
  • Set up an equation in the following cases : (i) Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. (Take to be the number of Parmit's marbles). (ii) Laxmi's father is 49 years old. He is 4 years older than three times Laxmi's age. (Take Laxmi's age to be y years.) (iii) The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest score is 87. (Take the lowest score to be ). (iv) In an isosceles triangle, the vertex angle is twice either base angle. (Let the base angle be in degrees. Remember that the sum of angles of a triangle is 180 degrees). Sol. (i) Let be the number of Parmit's marbles. (ii) Let the age of Laxmi be y years. (iii) Let the lowest score be . (iv) Let the base angle of the isosceles triangle be b , so vertex angle . (angle sum property of triangle)

Exercise : 4.2

  • Give the first step you will use to separate the variable and then solve the equation (a) (b) (c) (d) (e) (f) (g) (h) Sol. (a) [Adding 1 both sides] (b) [Subtracting 1 both sides] (c) [Adding 1 both sides] (d) [Subtracting 6 both sides] (e) [Adding 4 both sides] (f) [Adding 4 both sides] (g) [Subtracting 4 both sides] (h) [Subtracting 4 both sides]
  • Give the first step you will use to separate the variable and then solve the equation : (a) (b) (c) (d) (e) (f) (g) (h) Sol. (a) [Dividing both sides by 3] (b) [Multiplying both sides by 2] (c) [Multiplying both sides by 7] (d) [Dividing both sides by 4] (e) [Dividing both sides by 8] (f) [Multiplying both sides by 3] (g) [Multiplying both sides by 5] (h) [Dividing both sides by 20]
  • Give the steps you will use to separate the variable and then solve the equation : (a) (b) (c) (d) Sol. (a) Step I: [Adding 2 both sides] Step II: [Dividing both sides by 3 ] (b) Step I: [Subtracting 7 both sides] Step II: [Dividing both sides by 5] (c) Step I: [Multiplying both sides by 3] Step II: [Dividing both sides by 20] (d) Step I: [Multiplying both sides by 10] Step II: [Dividing both sides by 3]
  • Solve the following equations : (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) Sol. (a) [Dividing both sides by 10] (b) [Subtracting 10 on both sides] [Dividing both sides by 10] (c) [Multiplying both sides by 4] (d) [Multiplying both sides by -3 ] (e) [Multiplying both sides by 4] [Dividing both sides by 3] (f) [Dividing both sides by 3] (g) [Subtracting 12 on both sides] [Dividing both sides by 3] (h) [Dividing both sides by 3] (i) [Dividing both sides by 2] (j) [Adding both sides 6] [Dividing both sides by 2] (k) [Subtracting 6 on both sides] [Dividing both sides by 2] (l) [Subtracting 6 on both sides] [Dividing both sides by 2]

Exercise : 4.3

  • Solve the following equations: (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) Sol. (a) (b) (c) (d) (e) (f) (g) (h) (i) (j)
  • Solve the following equations : (a) (b) (c) (d) (e) Sol. (a) (b) (c) (d) (e)
  • Solve the following equations: (a) (b) (c) (d) (e) Sol. (a) (b) (c) (d) (e)
  • (a) Construct 3 equations starting with x (b) Construct 3 equations starting with x = -2 Sol. (a) 3 equations starting with . (i) Multiplying both sides by 10 , Adding 2 both sides (ii) Multiplying both sides by 5 Subtracting 3 from both sides (iii) Dividing both sides by 5 (b) 3 equations starting with . (i) Multiplying both sides by 3 (ii) Multiplying both sides by 3 Adding 7 to both sides (iii) Multiplying both sides by 3 Adding 10 to both sides

Exercise : 4.4

  • Set up equations and solve them to find the unknown number in the following cases : (a) Add 4 to eight times a number, you get 60 . (b) One-fifth of a number minus 4 gives 3 . (c) If I take three-fourth of a number and add 3 to it, I get 21. (d) When I subtracted 11 from twice a number, the result was 15. (e) Munna subtracts thrice the number of notebooks he has, from 50 , find the result to be 8 . (f) Ibenhal thinks of a number. If she adds 19 to it and divides the sum by 5 , she will get 8. (g) Anwar thinks of a number. If he takes away 7 from of the number, the result is . Sol. (a) Let the number be . According to the question, (b) Let the number be . (c) Let the number be z . According to the question, (d) Let the number be x . According to the question, (e) Let the number be . According to the question, (f) Let the number be . According to the question, (g) Let the number be x . According to the question,
  • Solve the following: (a) The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest score is 87 . What is the lowest score? (b) In an isosceles triangle, the base angles are equal. The vertex angle is . What are the base angles of the triangle? (Remember, the sum of three angles of a triangle is ). (c) Sachin scored twice as many runs as Rahul. Together, their runs fell two shorts of a double century. How many runs did each one score? Sol. (a) Let the lowest marks be . According to the question, Thus, the lowest score is 40 . (b) Let the base angle of the triangle be b . Given, Since, [Angle sum property of a triangle]

the sum of three angles of a triangle is 180

  • Thus, the base angles of the isosceles triangle are each. (c) Let the score of Rahul be x runs and Sachin's score is 2 x . According to the question, Thus, Rahul's score runs And Sachin's score runs.
  • Solve the following: (i) Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. How many marbles does Parmit have? (ii) Laxmi's father is 49 years old. He is 4 years older than three times Laxmi's age. What is Laxmi's age? (iii) People of Sundargam planted trees in the village garden. Some of the trees were fruit trees. The number of non-fruit trees were two more than three times the number of fruit trees. What was the number of fruit trees planted if the number of non-fruit trees planted was 77? Sol. (i) Let the number of marbles Parmit has be . According to the question, Thus, Parmit has 6 marbles. (ii) Let the age of Laxmi be y years. Then her father's age Thus, the age of Laxmi is 15 years. (iii) Let the number of fruit trees be . Then the number of non-fruits tree According to the question, Thus, the number of fruit trees are 25.
  • Solve the following riddle : I am a number, Tell my identity! Take me seven times over and add a fifty! To reach a triple century, you still need forty! Sol. Let the number be . According to the question, 300 Thus, the required number is 30 .

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