1. HCF & LCM – Prime Factorisation – Foundation – GCSE Questions
These questions are the same format as previous GCSE exams.
COPY means they use the exact same numbers as the original GCSE question.
Otherwise, they are clone questions using different numbers.
The worksheets are provided in a variety of sizes.

2. Printing To print handouts from slides -
Select the slide from the left. Then click:
File > Print > ‘Print Current Slide’
To print multiple slides -
Click on a section title to highlight all those slides,
or press ‘Ctrl’ at the same time as selecting slides to
highlight more than one. Then click:
File > Print > ‘Print Selection’
To print double-sided handouts -
Highlight both slides before using ‘Print Selection’.
Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.

3. GCSE GCSE Edexcel Foundation: June 2018 Paper 2, Q21
(a) Find the lowest common multiple (LCM) of 30 and 54 1
(a) Find the lowest common multiple (LCM) of 30 and 54
(2)
(2)
A = 2 × 33 × 5 B = 23 × 32 × 52
(b) Write down the highest common factor (HCF) of A and B.
A = 2 × 33 × 5 B = 23 × 32 × 52
(b) Write down the highest common factor (HCF) of A and B.
(1)
(1)
(Total for Question 1 is 3 marks)
(Total for Question 1 is 3 marks)

5. GCSE Edexcel Foundation: June 2018 Paper 2, Q21 1
(a) Find the lowest common multiple (LCM) of 30 and 54
(2)
A = 2 × 33 × 5 B = 23 × 32 × 52
(b) Write down the highest common factor (HCF) of A and B.
(1)
(Total for Question 1 is 3 marks)

6. GCSE
Edexcel Foundation: June 2018 Paper 2, Q21 1
(a) Find the lowest common multiple (LCM) of 30 and 54
30, 60, 90, 120, 150, 180, 210, 240, 270
54, 108, 162, 216, 270 OR
30: 2 × 3 × 5
54: 2 × 3 × 9
LCM = 2 × 3 × 5 × 9 = 270
270
(2)
A = 2 × 33 × 5 B = 23 × 32 × 52
(b) Write down the highest common factor (HCF) of A and B.
HCF = shared factors
= 2 × 32 × 5 = 90 90
(1)
(Total for Question 1 is 3 marks)

7. tom@goteachmaths.co.uk Questions? Comments? Suggestions?
…or have you found a mistake!?
Any feedback would be appreciated .
Please feel free to