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An odd one out debate gives children an opportunity to use each other as sounding boards and debate different ideas based on their knowledge and understanding of numbers. Just a few examples include balloon debates, true or false statements, deliberate mistakes, posters, spider diagrams, mind maps, card sorting, thought experiments and graphic organisers. John Dabell is a Year 6 teacher and maths co-ordinator at Forest Fields Primary and Nursery in Nottingham RESOURCES Resource Pack for Assessment for Learning in Mathematics, edited by Doug French (2005) Pounds 14.99; www.m-a.org.uk Children's Errors in Mathematics, edited by Alice Hansen (2005) Pounds 15; www.learningmatters.co.uk Multiplication Makes Bigger and other Mathematical Myths, by Pete Griffin and Sue Madgwick (2005) Pounds 19.50; www.devon.gov.uk/online_shop Concept Cartoons in Mathematics by John Dabell, Brenda Keogh and Stuart Naylor (2008) Pounds 40; www.millgatehouse.co.uk.