This topic is one of my personal enthusiasms and one that I always enjoy sharing with primary school teachers. My involvement in classroom-based research in this area goes all the way back to my 1984 PhD, which I did part-time at London University. Over the years I have been privileged to explore the topic further with various groups of more able children in primary schools, particularly at Cringleford Primary, a local school on the edge of Norwich close to the University. So, I have plenty of material from interacting with children to share on this subject – and I hope this will entertain and stimulate the troops in Ormskirk.
The following weekend I shall be doing a repeat performance in Birmingham, with another cohort of mathematics specialist teachers.
I see that Ian Sugarman is doing a session after me at Edge Hill on place value and calculation. He's always good value – likewise, Ian Thomson, who is doing the same session at the Birmingham event.