I think I’ll include a little sub-section for people like me (i.e. inexperienced teachers) for topics and conventions that aren’t easily explained, or where there is a ‘rule’ that can be applied without being understood. Most of these posts will be pilfered from others.
Today’s is ‘why do we turn the second fraction upside down?’
A good little slideshow (in terms of content) is can be found here. For those reluctant to navigate away (ha!), here is a summary:
I think this will appeal to some of my classes – but will have to formulate a neat explanation of reciprocal without sending the lesson off in the wrong direction…