The practice assignments in a mathematics textbook or course can be arranged so that most of the problems relating to any particular concept are massed together in a single assignment, or these related problems can be distributed across many assignments–a format known as spaced practice. Here we report the results of two classroom experiments that assessed the effects of mathematics spacing on both test scores and students' predictions of their test scores. In each experiment, students in Year 7 (11–12 years of age) either massed their practice into a single session or divided their practice across three sessions spaced 1 week apart, followed 1 month later by a test. In both experiments, spaced practice produced higher test scores than did massed practice, and test score predictions were relatively accurate after spaced practice yet grossly overconfident after massed practice.

中文翻译：

---

间隔数学练习可提高考试成绩并减少过度自信

可以安排数学教科书或课程中的练习作业，以便将与任何特定概念相关的大多数问题集中在一个作业中，或者这些相关问题可以分布在许多作业中——这种格式称为间隔练习。在这里，我们报告了两个课堂实验的结果，这些实验评估了数学间距对考试成绩和学生对考试成绩的预测的影响。在每个实验中，7 年级（11-12 岁）的学生要么将他们的练习集中在一个单独的时段中，要么将他们的练习分成三个间隔 1 周的时段，然后在 1 个月后进行测试。在这两个实验中，间隔练习比集体练习产生了更高的考试分数，