Expression using letter Numbers

Why is learning algebraic expressions important?

1. They are used only in school examinations.
2. They help represent mathematical relationships, solve problems, and prepare students for advanced mathematics.
3. They replace arithmetic completely.
4. They are useful only for scientists.

Why do mathematicians use variables?

1. To make mathematics more confusing
2. To represent unknown or changing quantities
3. To replace numbers permanently
4. To avoid calculations

If a = 4 and b = 6, what is the value of a + b?

1. 8
2. 9
3. 10
4. 24

Which expression represents "twice a number"?

1. x + 2
2. x − 2
3. 2x
4. x ÷ 2

What does the expression 3a mean?

1. 3 + a
2. 3 ÷ a
3. 3 × a
4. a − 3

Which of the following is NOT an algebraic expression?

1. 7m − 2
2. 5x + 9
3. 12 + 8
4. a ÷ 4

What is the value of 2y + 3 if y = 5?

1. 10
2. 13
3. 15
4. 8

Which expression represents "a number increased by 9"?

1. x − 9
2. x × 9
3. x + 9
4. 9 − x

Which symbol is generally used to represent an unknown number?

1. +
2. x
3. =
4. ÷

What is the value of 5n if n = 7?

1. 12
2. 35
3. 57
4. 75

Which of the following is the constant term in the expression 4a + 12?

1. 4
2. a
3. 12
4. 4a

What is the coefficient of x in the expression 9x + 5?

1. 5
2. 9
3. x
4. 14

If x = 6, what is the value of x + 8?

1. 12
2. 14
3. 48
4. 8

Which of the following is an algebraic expression?

1. 7 + 5 = 12
2. 3x + 4
3. 18 ÷ 6
4. 20 − 10 = 10

What is a letter-number in mathematics?

1. A punctuation mark
2. A letter used to represent a number or an unknown value
3. A type of fraction
4. A unit of measurement