By Andrew Jennings
By Georgina Green, Maarten Lenoir
By Macdonald, Ian
By Clarke, Zoe
By Powell, Jillian
By Zoe Clarke, Lee Cosgrove
By Collins Maps
By Browne, Andrew
By Various
By Annie O. Warburton
By Sanderson, Ana, Harrop, Beatrice, McKee, David, Collins Music
By David Gadsby, Beatrice Harrop, david mckee, Collins Music
By Peet, Sue
By Martin Old
By Rosalind Kerven
By Anne Glennie
By School Mathematics Project
By Iris Howden
By Alice Hansen
By Mary Read MacDonald
By Kate Tucker
By Paul Broadbent, Peter Patilla
By Collins Easy Learning
By Anita Straker (National Numeracy Project)
By Unknown