By Newton, Derek, Smith, David
By Wheelocks
By Bradfield, Philip, Potter, Steve
By McCullagh, Patrick
By Middleton, Haydn
By Snashall, Sarah
By Gallagher, Eithne, Hamayan, Else
By Hubbard, Peter
By Escott, John
By Bassett, Jennifer
By Seely, John, Durant, Richard, Green, Frank
By Pearson Education Ltd.
By SPMG, Scottish Primary Maths Group
By Mayhew, Susan
By Yayock, J., Lombin, G., Owonubi, J. J.
By Laogun, E
By Sam McCarter
By Guest, John
By D J Ward
By Pearce, Malcolm L., Stewart, Geoffrey
By Ridgway, Bill
By Case, S.L., Hall, David John
By Merttens, Ruth, Ruth Merttens, Dave Kirkby
By Merttens, Ruth, Ruth Merttens
By Euripides, Harrison, John
By School Mathematics Project
By Jones, Geoff., Mary Jones, Phillip Marchington and David Acaster., Geoffrey, Mary, Marchington, Phillip, Acaster, David, Phillip Marchington and David Acaster. Jones