Prime Deductions
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Lesson details
Key learning points
- In this lesson, we will use our knowledge of prime factorisation to deduce the factors of numbers.
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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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
5 Questions
Q1.
75 = 15 x .....
15
25
3
Q2.
168 = ..... x 21
14
42
6
Q3.
Which of these is not a factor of 42?
14
21
6
Q4.
One of the factors of 168 is a square number.
False
Q5.
Which two numbers will multiply to make a square number?
245 and 30
30 and 42
72 and 245