By Collins GCSE
By Hine, Gregory, Reaburn, Robyn, Anderson, Judy, Galligan, Linda, Carmichael, Colin, Cavanagh, Michael, Ngu, Bing, White, Bruce
By Scottish Primary Mathematics Group
By Morgan, Rowland
By Kathryn Scott, Janet Crawshaw, Scott, Kathryn, Crawshaw, Janet
By Riddington, Mark, Grier, Martin
By Pearce, Chris
By John L Cable
By Graham Galtrey
By Sherran, Peter
By Ann Montague-Smith
By Nicholson, Su
By Schofield & Sims, Ann Montague-Smith
By Keith Sharp, Ian Graham Wilson, Sharp, Keith, Wilson, Ian Graham
By School Mathematics Project
By Hogan, Paul, Job, Barbara, Morley, Diane, Newman, Graham
By Gordon, Keith
By John Jeskins, Howard Baxter, Jean Matthews, Michael Handbury, Mark Patmore, Jeskins, John, Baxter, Howard, Matthews, Jean, Handbury, Michael, Patmore, Mark
By Hardy, Tansy, etc., Haworth, Anne