págs. 253-295
Elapsed time: why is it so difficult to teach?
págs. 296-315
Measure for Measure: what Combining Diverse Measures Reveals About Children's Understanding of the Equal Sign as an Indicator of Mathematical Equality
Percival G. Matthews, Bethany Rittle-Johnson, Katherine L. McEldoon, Roger S. Taylor
págs. 316-350
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