Last week on Guess the Misconception we looked at plotting cumulative frequency diagrams (see previous post for the results), and in a dramatic twist, the misconception that was the least voted for by teachers actually turned out to be the most popular misconception held by students. This week we turn our attention to the classic Higher Tier GCSE topic of Rationalising the Denominator with Surds.

How will you fare predicting the most common student misconception on this question on rationalising the denominator, which is again taken from the free GCSE Higher Revision Stream, that over 10,000 students across the UK have signed up to. And if you haven’t yet signed up, then with less than 50 days to go until the Maths GCSE, now is the perfect time to jump on board!

Can you predict the most common way students went wrong with this one? Get your votes in, share with your colleagues and students to see what they think, and the answers will be revealed next week!

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Sign your students up to the free Daily GCSE Revision Streams today. They will receive two lovely questions to answer – either Higher or Foundation – every day up to the GCSE exam, and you will receive a daily pdf report on your students’ performance. For more ideas on how to use Diagnostic Questions to help prepare your students for the GCSEs, see this blog post.