11 Plus Exams Forum • Prime Number Questions in MATHS

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Prime Number Questions

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RedDevil66

Post subject: Prime Number Questions

Posted: Mon May 20, 2019 7:31 am

Joined: Tue May 22, 2018 7:23 am
Posts: 104

Hi Folks
Any good sites/worksheets for calculating and practising the type of questions. e.g

Which three prime numbers multiply together to make 154?

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Choccy74

Post subject: Re: Prime Number Questions

Posted: Mon May 20, 2019 11:20 am

Joined: Wed Nov 28, 2018 11:51 pm
Posts: 38

2, 7 and 11

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solimum

Post subject: Re: Prime Number Questions

Posted: Mon May 20, 2019 4:22 pm

Joined: Wed May 09, 2007 2:09 pm
Posts: 1126
Location: Solihull, West Midlands

Googled "Prime factorisation worksheet" and got this:

https://www.easyteacherworksheets.com/m ... ctors.html

Lots of understanding about odd/even numbers, knowing the tricks to see what numbers are divisible by 3 / 5 etc is really needed, and then lots of practice at dividing by 2/3/5/7 - there are no short cuts

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RedDevil66

Post subject: Re: Prime Number Questions

Posted: Tue May 21, 2019 7:11 am

Joined: Tue May 22, 2018 7:23 am
Posts: 104

solimum wrote:

Thanks a lot. Very helpful

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