Expressions using Letter-Numbers — Practice

Q1. Of Ganita Prakash Part 1, letters such as 'a' and 's' that are used to represent numbers are called

• A. Letter-numbers
• B. Constants
• C. Operators
• D. Indices

Q2. Mathematical expressions that contain letter-numbers, such as a + 3, are called

• A. Arithmetic expressions
• B. Algebraic expressions
• C. Numerical statements
• D. Equations

Q3. Shabnam is 3 years older than Aftab. If 'a' denotes Aftab's age and 's' denotes Shabnam's age, which expression gives Shabnam's age?

• A. s = a - 3
• B. s = 3 - a
• C. s = a + 3
• D. s = 3a

Q4. If Shabnam is 3 years older than Aftab and Aftab's age is 18 years, what is Shabnam's age?

• A. 15 years
• B. 18 years
• C. 20 years
• D. 21 years

Q5. Aftab is 3 years younger than Shabnam. If Shabnam's age is 20 years, the expression a = s - 3 gives Aftab's age as

• A. 23 years
• B. 17 years
• C. 20 years
• D. 3 years

Q6. Parthiv arranges Ls side by side, where each L uses 2 matchsticks. If 'n' denotes the number of Ls, which expression gives the number of matchsticks needed?

• A. 2 × n
• B. n + 2
• C. n - 2
• D. n / 2

Q7. Example 4 says the perimeter of a square is 4 times the length of its side. If 'q' denotes the side length, which expression gives the perimeter?

• A. q + 4
• B. 4 + q
• C. 4 × q
• D. q - 4

Q8. Figure it Out Q1(a) asks for the perimeter of a triangle with all sides equal. If 'a' denotes the side length, the perimeter is

• A. 2a
• B. 3a
• C. 4a
• D. 6a

Q9. If 'a' denotes the side length of a regular hexagon, its perimeter is

• A. 3a
• B. 4a
• C. 5a
• D. 6a

Q10. If a = 23, what is the value of the expression a + 3?

• A. 26
• B. 20
• C. 69
• D. 233

Q11. When k = 4, the value of the expression 7k is

• A. 11
• B. 47
• C. 28
• D. 74

Q12. In algebra, the expression 4n is short for

• A. 4 + n
• B. 4 × n
• C. n - 4
• D. n / 4

Q13. When the multiplication sign is omitted between a number and a letter, the standard convention is to write

• A. The letter first, then the number — e.g., n4
• B. Only the number — e.g., 4
• C. Only the letter — e.g., n
• D. The number first, then the letter — e.g., 4n

Q14. Sets of terms that involve the same letter-numbers are called

• A. Like terms
• B. Unlike terms
• C. Equal terms
• D. Constant terms

Q15. Which of the following pairs is an example of unlike terms?

• A. 5c and 10c
• B. 12n and -4n
• C. 18c and 11d
• D. 3a and a