Having just spent a large chunk of my afternoon battling with Moodle’s quiz functions, fortunately I also came up with something a little more fun, interactive and actually quite challenging: quadratics top trumps.

## Starter for 10

Here is a sketch of the graph for certain values of *a*, *b* and *c*:

- Is
*a*positive, zero or negative? - Is
*b*positive, zero or negative? (Careful!) - Is
*c*positive, zero or negative? - Is
*ac*positive, zero or negative? - Is
*b²-4ac*positive, zero or negative?

## Top Trumps

I’ve written up a few more details in this Top Trumps Powerpoint (sorry but the graphs are a little small and uninspiring – perhaps someone is willing to tart them up a bit?!). Essentially, students play in pairs and try to pick a property (*a*, *b*, *c*, *ac*, *b²-4ac*) that they hope will beat their opponent. (Positive beats Zero beats Negative.)

## Starters and Variations

In the Powerpoint, I mention a couple of possible starter activities to precede the game:

- Provide students with the same starter as in the blog post.
- Ask the students to sketch a quadratic for which, say,
*a*,*b*and*c*are all negative. - Try to limit the students from always choosing
*a*or*c*– perhaps require them to have used all 5 different properties before they can repeat a choice.

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