Highest common factors and prime factors
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Lesson details
Key learning points
- In this lesson, we will use venn diagrams to sort prime factors and to help in identifying highest common factors.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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6 Questions
Q1.
Which of these is not a factor of 27?
1
27
9
Q2.
Which is not a factor of 54?
27
6
9
Q3.
Which is a common factor of 28 and 36?
12
6
7
Q4.
What is the highest common factor of 6 and 9?
1
54
6
Q5.
What is the HCF of 30 and 42?
12
4
Q6.
True or False? If the HCF is 12, then 4 and 3 are common factors.
False
5 Questions
Q1.
Which represents 24 as a product of prime factors?
=2 × 2 × 3× 3
2 × 2 × 2 × 2
Q2.
What number should replace the square in the Venn diagram?
14
4
Q3.
What number should replace the square in the Venn diagram?1
2
6
Q4.
Using the Venn diagram, what is the HCF of 24 and 36?
24
7
Q5.
True or False? Sometimes there isn’t a highest common factor!
True