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Dyfyniad Arddull ChicagoCollars, Charlotte, Koay Phong Lee, Lee Ngan Hoe, and Tan Cheow Seng. Shaping Maths: Activity Book. Singapore: Federal Publications, 2003.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.