NCERT Class 7 Maths Chapter 4 Expressions using Letter Numbers Extra Questions with Answers

Class 7 Maths Chapter 4 Extra Questions with Answers

Q1. What is an algebraic expression?
Answer: An algebraic expression is a combination of numbers, variables (letters), and mathematical operations.

Q2. Identify the variable in the expression 5x + 7.
Answer: x

Q3. Identify the constant in the expression 8y − 4.
Answer: −4

Q4. How many terms are there in the expression 3a + 5b − 7?
Answer: 3 terms

Q5. Evaluate 4x + 3 when x = 5.
Answer: 23

Q6. Find the value of 2a − 6 when a = 8.
Answer: 10

Q7. Write an expression for "a number increased by 9."
Answer: x + 9

Q8. Write an expression for "five times a number."
Answer: 5x

Q9. What is the coefficient of x in 9x + 4?
Answer: 9

Q10. What is the coefficient of y in 7y − 2?
Answer: 7

Q11. Simplify: 4a + 3a
Answer: 7a

Q12. Simplify: 9x − 2x
Answer: 7x

Q13. Evaluate 3m + 8 when m = 6.
Answer: 26

Q14. Write an expression for "the sum of p and 12."
Answer: p + 12

Q15. Why are variables used in mathematics?
Answer: Variables are used to represent unknown quantities and to write general mathematical expressions and formulas.