By Kearsley Bullen, Rob, Edmondson, Andrew, Ward, Tony
By Pledger, Keith, Kent, Mr David
By School Mathematics Project
By Cole, Mr Gareth, Jolly, MR Peter, Kent, Mr David, Pledger, Keith
By Bright, Ms Sue, Birkett, Dan, Pledger, Keith
By Author Team, Combined
By SPMG, Scottish Primary Maths Group
By Robert Glen
By Bullen, Rob Kearsley
By Speed, Brian
By Bolt, Brian
By Marilyn Burns, Burns, MARILYN
By School Mathematics Project, Unnamed