Ffeithiau rhif a chyfrifiadau.
Koll, Hilary.
Mills, Steve,1955-
Clubb, Sara.
Jones, Lynwen Rees.
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : CAA,
c2010.
Cyhoeddwyd y fersiwn Saesneg yn wreiddiol = Originally published in English: London: A. & C. Black, 2008.
'Adnoddau addysgu Mathemateg y gellir eu haddasu, caniateir llungopïo' - clawr = cover.
Mathematics
Arithmetic