Starter quiz
- Match the expression to the correct square number.
- 22⇔4 ✓
- 32⇔9 ✓
- 112⇔121 ✓
- 82⇔64 ✓
What square number is represented by this incomplete factor bug?- '100' ✓
- What is the missing factor of 38 from this list? 1, 2, 19
- '38' ✓
- The number 12 has ______ factors.
- '6' ✓
- The number 30 has ______ factors.
- '8' ✓
- Tick the numbers which are factors of both 15 and 20
- 1 ✓
- 2
- 5 ✓
- 10
- 15
-
Exit quiz
- Exactly how many factors does a prime number have?
- 1
- 2 ✓
- 4
- It depends on the prime number.
-
- Match the number to the correct type.
- Prime number⇔13 ✓
- Composite number⇔12 ✓
- Square number⇔16 ✓
- What is the next prime number after 13?
- '17' ✓
- True or false: 27 is a prime number.
- True
- False ✓
- Select the composite numbers.
- 2
- 4 ✓
- 10 ✓
- 16 ✓
- 19
-
- Select the prime numbers.
- 1
- 3 ✓
- 9
- 15
- 19 ✓
-
Worksheet
Presentation
Video
Lesson Details
Key learning points
- A prime number has only 2 factors, 1 and itself.
- A composite number is a number with more than 2 factors.
Common misconception
Every number has one and itself as a factor, so every number is a prime number.
Ensure pupils explore the different arrangements that numbers can make with tiles in arrays. Point out that the numbers which cannot be arranged in any way except for one row or column are prime numbers.
Keywords
Factor - A factor is a whole number which exactly divides another whole number.
Prime number - A prime number is a whole number greater than one which has exactly two factors.
Composite number - A composite number is a whole number which has more than two factors.
Square number - A square number is the result of multiplying an integer (not a fraction) by itself.
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