The number zoo
Download a PDF file with a simple worksheet about number types. I’m on a bit of a mission to sneak the Venn diagram into some of my level 2 Maths classes as a visual aid.
The discussion about irrational numbers focussed attention on the idea of rounding, and gave me a chance to talk about trial and improvement in connection with a simple ‘divide and average’ method for finding the square root of two.