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Research Commentary: The Effects of Spacing and Mixing Practice Problems

Doug Rohrer 

January 2009, Volume 40, Issue 1, Page 4

Sets of mathematics problems are generally arranged in 1 of 2 ways. With blocked practice, all problems are drawn from the preceding lesson. With mixed review, students encounter a mixture of problems drawn from different lessons. Although mixed review is more demanding than blocked practice, the apparent benefits of mixed review suggest that this easily adopted strategy is underused.

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