Substitution into Algebraic Expressions

Name: _____________________________
Date: _____________________________

Instructions: Substitute the given values into each expression and work out the answer. Show your working.

Section A: Single Variable

1. If n = 5, find the value of:

a) 3n = _________________

b) n + 8 = _________________

c) 2n − 4 = _________________

d) 20 ÷ n = _________________

2. If x = 12, find the value of:

a) x − 7 = _________________

b) x ÷ 4 = _________________

c) 5x = _________________

d) x + 15 = _________________

Section B: Two Variables

3. If a = 6 and b = 4, find the value of:

a) a + b = _________________

b) a − b = _________________

c) 3a + b = _________________

d) 2a + 2b = _________________

4. If m = 10 and n = 3, find the value of:

a) m − n = _________________

b) m + 5n = _________________

c) 2m − n = _________________

d) m ÷ 2 + n = _________________

Section C: Challenge Problems

5. If p = 8 and q = 5, find the value of:

a) 4p − 3q = _________________

b) p × q ÷ 2 = _________________

6. If x = 7 and y = 2, find the value of:

a) 5x − 6y = _________________

b) (x + y) × 3 = _________________