Deall siapiau a mesurau.
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Mills, Steve,1955-
Jones, Lynwen Rees.
University of Wales, Aberystwyth.Centre for Educational Studies.
Aberystwyth : CAA,
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"Adnoddau addysgu mathemateg y gellir eu llungopïo" - t.p.
Arg. Saesneg gwreiddiol = Original English ed.: London : A. & C. Black, 2008.
Mathematics
Form perception
Size perception
Measurement