Ffocws rhifedd.
Frobisher, L. J.
Ebbutt, Sheila.
Qualifications, Curriculum & Assessment Authority for Wales.
Caergybi : Wasg Taf Cyf,
2002.
Argraffiad Saesneg gwreiddiol = Original English edition : Oxford : Rigby, 2000.
Addasiad Cymraeg gan = Welsh adaptation by : Awdurdod Cymwysterau, Cwricwlwm ac Asesu Cymru.
Numeracy