π― Maths

# How do I find prime factors of a number?

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Answered Sep 18Maths

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Pellumb AhmetajQTS Secondary school Head of Maths teacher with 5 years experience πͺπ―143 students helped

Taking the number 30 as an example. We have to identify the lowest prime that 30 is divisible by, in this case 2. We perform 30 divided by 2 and get an answer of 15. We repeat the process with 15 and find the lowest prime it is divisible by, in this case 3. We perform 15 divided by 3 and get an answer of 5 which is also a prime. This means that 30 = 2 x 3 x 5. Visually you should use a prime factor tree to work this out for more complicated/larger numbers