Lesson details

Key learning points

  1. 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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5 Questions

Q1.
Which of these numbers is not prime?
13
2
Correct answer: 27
31
Q2.
Which of these numbers is prime?
Correct answer: 37
57
75
87
Q3.
Which of these is the prime factorisation of 30?
2 x 15
2 x 2 x 5
Correct answer: 2 x 3 x 5
5 x 6
Q4.
Which of these is the prime factorisation of 50?
1 x 50
2 x 25
Correct answer: 2 x 5 x 5
5 x 10
Q5.
What is the final digit for this number:
1
Correct answer: 3
7
9

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

Lesson appears in

UnitMaths / Prime factor decomposition