Year 7
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Lesson details
Key learning points
- In this lesson, we will investigate how to write a number as a product of its prime factors. We investigate the concept of prime factorisation
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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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5 Questions
Q1.
Which of these numbers is not prime?
13
2
31
Q2.
Which of these numbers is prime?
57
75
87
Q3.
Which of these is the prime factorisation of 30?
2 x 15
2 x 2 x 5
5 x 6
Q4.
Which of these is the prime factorisation of 50?
1 x 50
2 x 25
5 x 10
Q5.
What is the final digit for this number:
1
7
9
5 Questions
Q1.
Express 42 as a product of its prime factors
2 x 21
2 x 3 x 3
6 x 7
Q2.
Express 144 as a product of its prime factors.
12 x 12
2 x 2 x 3 x 3 x 3 x 3
2 x 6 x 2 x 6
Q3.
Express 80 as a product of its prime factors.
2 x 2 x 2 x 10
2 x 4 x 2 x 5
8 x 10
Q4.
Express 35 x 10 as a product of its prime factors.
35 x 2 x 5
350
5 x 7 x 10
Q5.
Express 1750 as a product of its prime factors
10 x 175
2 x 5 x 175
2 x 5 x 5 x 35