Professional Development

Maths' Many Misconceptions: Factors, Multiples, Primes

In this video I use some of the 200+ million answers on my Diagnostic Questions website to unearth where students do really well and where they struggle with factors, multiples and primes. I then share some of my favourite resources and pedagogical approaches for dealing with the misconceptions and troublesome areas the questions uncover.

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About Craig Barton

Craig Barton has been involved in teaching maths for 15 years. He is the Head of Education at Eedi, the TES Maths Adviser, the author of the best-selling books “How I wish I’d taught maths” and "Reflect, Expect, Check, Explain", the host of the Mr Barton Maths Podcast, the creator of,,, and, and Visiting Fellow at the Mathematics Education Centre at Loughborough University. He has been lucky enough to teach maths and work with teachers all over the world.

His two proudest achievements are convincing Kate to marry him, and being the father to our wonderful baby boy, Isaac.

Ages: Primary, Secondary