Member of the e-learning unit in Newcastle University's School of Mathematics and Statistics.

Lead developer of Numbas.

I'm happy to answer any questions - email me.

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Christian Lawson-Perfect on Volume of cylinder 1 day, 3 hours ago

Set accuracy to 0 so the exact value must be given, i.e. in terms of $\pi$ instead of a single decimal.

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Christian Lawson-Perfect on Area of Triangle 1 day, 3 hours ago

Saved a checkpoint:

Fixed the measurements in drawingA

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Christian Lawson-Perfect on Expanding Two Brackets 1 day, 3 hours ago

Saved a checkpoint:

Fixed the pattern restriction so a negative quadratic term with no coefficient is OK.

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Christian Lawson-Perfect on Linear Equations 1 month ago

Saved a checkpoint:

Thanks! I've fixed both of those.

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Christian Lawson-Perfect on Calculate the median of a sample - increasing difficulty 1 month, 2 weeks ago

Gave some feedback: Ready to use