| Catherine (Katy) Ulrich - Vol. 35 Num. 3 (2015) | ||
| Stages in constructing and coordinating units additively and multiplicatively (Part 1) ABSTRACT | 2-7 | |
| Catherine (Katy) Ulrich - Vol. 36 Num. 1 (2016) | ||
| Stages in constructing and coordinating units additively and multiplicatively (part 2) ABSTRACT | 34-39 | |
for the learning of mathematics
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