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Lesson details

Key learning points

  1. 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
Correct answer: 2 x 3 x 7
6 x 7
Q2.
Express 144 as a product of its prime factors.
12 x 12
Correct answer: 2 x 2 x 2 x 2 x 3 x 3
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
Correct answer: 2 x 2 x 2 x 2 x 5
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
Correct answer: 5 x 7 x 5 x 2
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
Correct answer: 2 x 5 x 5 x 5 x 7

5 Questions

Q1.
75 = 15 x .....
An image in a quiz
15
25
3
Correct answer: 5
Q2.
168 = ..... x 21
14
42
6
Correct answer: 8
Q3.
Which of these is not a factor of 42?
14
21
Correct answer: 4
6
Q4.
One of the factors of 168 is a square number.
False
Correct answer: True
Q5.
Which two numbers will multiply to make a square number?
245 and 30
30 and 42
Correct answer: 42 and 168
72 and 245

Lesson appears in

UnitMaths / Prime factor decomposition