Starter quiz
- Fill in the missing word: Integers greater than 1 are either composite or ______.
- 'prime' ✓
- Which of the following shows that 77 is a composite number?
- 77 × 1
- 7 × 11 ✓
- 1 × 77
- 11 × 7 ✓
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- What is the missing number in the first step in the process to find prime factors of 75? ______
- '25' ✓
- What is the missing product in this process to find prime factors of 75?
- 15 + 10
- 20 + 5
- 1 × 25
- 5 × 5 ✓
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- Given 120 = , which of the following equals 360?
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- ✓
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- Given 120 = , which of the following equals 60?
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- ✓
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Exit quiz
- A square number is the product of two ______ integers.
- 'repeated' ✓
- Write as an integer.
- '60' ✓
- True or false? is an even integer.
- True, it has a factor of 2 ✓
- False, the exponent is odd
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- True or false? is a multiple of 10
- True, 5 is a factor and 10 is a multiple of 5
- False, to be a multiple of 10 it must have a factor of 2 and 5 ✓
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- Which of the following is not a multiple of 6?
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- ✓
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- Which of the following is a square number?
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- ✓
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Worksheet
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Presentation
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Lesson Details
Key learning points
- Evaluating a product of primes will give a unique positive integer.
- It is useful to compare numbers using their prime factor product without evaluating the numbers.
- Square numbers can be identified from their product of primes.
- Common factors can be found by comparing the products of their primes.
Common misconception
Identifying if integer is a multiple when its given in its prime factor form.
Only the bases need to be considered, not the exponents. e.g if it is a multiple of 3 it must be a multiple of 3^2, 3^3, etc.
Keywords
Composite number - A composite number is an integer with more than two factors.
Product - A product is the result of two or more numbers multiplied together.
Prime factors - Prime factors are factors of a number that are, themselves, prime.
Exponent - An exponent is a number positioned above and to the right of a base value. It indicates repeated multiplication.
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