It is most useful after the underlying problem types have been taught well enough for the learner to attempt them.
Blocked practice gives away the method
If every question on a page is the same type, the child can often repeat the previous procedure without deciding what the new problem requires.[1]
Mixed practice adds discrimination
Classroom research has found that interleaving can improve delayed mathematics performance by requiring learners to distinguish among problem types.[2]
How good mixed practice is built
Good interleaving mixes skills that are ready to be compared, so children practise recognising which method fits instead of simply following a repeated pattern.[1]
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参考文献
- Doug Rohrer & Kelli Taylor (2007). The shuffling of mathematics problems improves learning. Instructional Science.
- Doug Rohrer, Robert F. Dedrick & Sandra Stershic (2015). Interleaved practice improves mathematics learning. Journal of Educational Psychology.