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_aNational Council of Teachers of Mathematics. _2Local _9141253 |
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_aTopics in mathematics for elementary school teachers. _lSpanish |
| 245 | 1 | 0 | _aSistemas de numeración para los números racionales. |
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_aMéxico _bEditorial Trillas _c1979. |
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_a59 p. _bill. _c23 cm. |
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_aTemas de matemáticas _v7 |
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_aArithmetic _xFoundations. _2Local _954423 |
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