Ffeithiau rhif a chyfrifiadau.
Koll, Hilary.
Mills, Steve,1955-
Jones, Lynwen Rees
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : CAA,
c2010.
"Adnoddau addysgu mathemateg y gellir eu llungopïo" - t.p.
Arg. Saesneg gwreiddiol = Original English ed.: London : A. & C. Black, 2008.
Mathematics
Arithmetic