NCERT Class 7 Maths Part 2 Chapter 7 Finding the Unknown Extra Questions with Answers

Class 7 Maths Part 2 Chapter 7 Extra Questions with Answers

Q1. What is a variable?
Answer: A variable is a letter used to represent an unknown value.

Q2. Solve: x + 8 = 15
Answer: x = 7

Q3. Solve: y − 9 = 12
Answer: y = 21

Q4. Solve: 5a = 40
Answer: a = 8

Q5. Solve: b ÷ 6 = 9
Answer: b = 54

Q6. Solve: 3x + 4 = 19
Answer: x = 5

Q7. Solve: 2m − 8 = 18
Answer: m = 13

Q8. Solve: 7p = 63
Answer: p = 9

Q9. Solve: n/5 = 11
Answer: n = 55

Q10. What is the first step in solving a linear equation?
Answer: Isolate the variable by performing inverse operations.

Q11. Which operation is the inverse of addition?
Answer: Subtraction.

Q12. Which operation is the inverse of multiplication?
Answer: Division.

Q13. Check the solution of x = 6 for x + 9 = 15. Is it correct?
Answer: Yes, because 6 + 9 = 15.

Q14. Why do we use equations in mathematics?
Answer: Equations help us find unknown values and solve real-life mathematical problems.

Q15. Where are linear equations used in daily life?
Answer: They are used in budgeting, shopping, age problems, distance calculations, business, and many real-life situations.