Evaluating One-Variable Expressions

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Mathematical expressions and variables illustration

📝 Part 1: Substitute and Evaluate

Instructions: Substitute the given value for the variable and solve each expression.

1. Evaluate 3x + 7 when x = 4

2. Evaluate 2y - 9 when y = 12

3. Evaluate 5n + 8 when n = 6

4. Evaluate 4a - 3 when a = 7

5. Evaluate 15 - 2m when m = 5

📊 Part 2: Word Problems

Instructions: Write an expression for each situation, then evaluate it using the given value.

6. Sarah buys 3 packs of stickers and gets 5 bonus stickers. If each pack has s stickers, write an expression for the total number of stickers. Then find the total when s = 8.

Expression: _______________

7. A movie theater charges $12 per ticket plus a $3 service fee per person. Write an expression for the total cost for t tickets. Then find the cost when t = 4.

Expression: _______________

8. Jake had 50 baseball cards and gave away c cards to his friends. Write an expression for how many cards he has left. Then find the answer when c = 18.

Expression: _______________