By Prof. Alistair Ross
By Royston Lambert, etc.
By Jason Busby, Zak Parrish, Jeff Wilson
By Aidan Warlow, Warlow, A.
By Aidan Warlow
By Anon
By Terry Jennings, Jennings, Terry, Haycock, Fred
By Mary Smart, Smart, Mary, Saunderson, C.
By Dee Reid, Diana Bentley, Norma Gaunt, Jane Whitwell, Reid, Dee, Bentley, Diana, Gaunt, Norma, Whitwell, Jane
By Barry Scholes, Gill Atha
By Kjartan Poskitt
By Kjartan Poskitt, Philip Reeve
By Miskin, Ruth
By Margaret Barratt
By Claire Llewellyn
By SPMG, Scottish Primary Maths Group
By Scottish Primary Mathematics Group