| E. B. C. Thornton - Vol. 5 Num. 2 (1985) | ||
| Communication: Four operations? Or ten? | 33-35 | |
for the learning of mathematics
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| E. B. C. Thornton - Vol. 5 Num. 2 (1985) | ||
| Communication: Four operations? Or ten? | 33-35 | |