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馃搻 Mathematics 12 minLesson 21 of 50
Prime Factorisation
Breaking numbers into primes is the key to finding common factors and multiples in advanced maths.
What you will learn
- A prime number is only divisible by 1 and itself.
- The Fundamental Theorem of Arithmetic states every integer greater than 1 is a product of primes.
- Use a factor tree to systematically break down any composite number.
How to Use Prime Factor Trees to find Prime Factors
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Watch once, then work through the practice sheet.
Practice sheets
3 printable PDFs1
Recall drill
5 questions 路 write-in answer lines
2
Apply it
4 questions 路 write-in answer lines
3
Test yourself
4 questions 路 write-in answer lines
Interactive quiz
Question 1 of 1What is the prime factorisation of 20?
