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Expressions and Prime Numbers
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Expressions and Prime Numbers
🔢 Part 1: Prime or Composite?
1. Circle whether each number is prime or composite:
a) 7: Prime or Composite
b) 9: Prime or Composite
c) 11: Prime or Composite
d) 15: Prime or Composite
2. Which statement is true about prime numbers?
They have exactly two factors: 1 and themselves
They have more than two factors
They are always even numbers
They are always odd numbers
3. List all the prime numbers between 10 and 20:
📝 Part 2: Understanding Expressions
4. Which of the following are expressions? (Check all that apply)
3 + x
5 = 2 + 3
2y + 7
x = 4
5. If x represents a prime number, find the value of the expression 2x + 1 when:
a) x = 2: 2x + 1 = _______
b) x = 3: 2x + 1 = _______
c) x = 5: 2x + 1 = _______
6. Write an expression using the variable y that includes addition:
🧠 Part 3: Connecting Concepts
7. Complete the statement: An expression is different from an equation because...
An expression has an equals sign
An expression asks a question that can be solved
An expression shows a value but doesn't ask a question
An expression always uses prime numbers
8. Challenge: If p represents any prime number greater than 2, what can you say about the expression p + 1?
It will always be prime
It will always be composite
It will always be even
It will always be odd
9. Explain your reasoning for question 8:
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