Cyfrif a deall rhifau.
Koll, Hilary.
Mills, Steve,1955-
Jones, Lynwen Rees.
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : CAA,
c2010.
Arg. Saesneg gwreiddiol = Original English ed.: London : A. & C. Black, 2008.
"Adnoddau addysgu Mathemateg y gellir eu haddasu, caniateir llungopïo" - ar y clawr = on cover.
Counting
Arithmetic