From at least the nineteenth century, educators have thought that playing with specially designed blocks would give children a tangible sense of mathematical relationships. The San Diego, California, ...

Corrected: An earlier version of this story misspelled the name of Julie Sarama, a researcher who has developed strategies for building the mathematical skills of preschool students. A pair of New ...

That cross-pollination is more difficult to achieve on the block model, where units of study run consecutively rather than concurrently, resulting in what might be termed the sawtooth model, where ...