Writing and mathematics are essential in academic achievement. In the present study, we investigated whether writing skills and mathematics skills are related and if so, whether their relation is moderated by participants’ grade level (a proxy for developmental phase), subskills of mathematics and writing skills, and assessment characteristics (normed and standardized nature of mathematics and writing tasks, and reliability of mathematics and writing measures), using a meta-analysis. A total of 211 studies (k = 564, N = 1,207,983) met inclusion criteria. Overall, mathematics and writing were moderately related (r = .48). The overall magnitude of their relation differed as a function of grade level such that the relation was stronger for students in primary grade levels compared to those in university and above. When explored by higher order and lower order writing and mathematics skills and grade levels, lower order writing and mathematics (.59) and higher order writing and mathematics (.48) had substantial relations in primary grades, whereas higher order writing and mathematics were weakly related in adulthood (.25). The relation also differed by the reliability of mathematics tasks such that the magnitude was stronger for mathematics tasks with higher reliability. For writing, the relation was stronger for writing tasks that were normed and standardized compared to those that were not. These results confirm not only a mathematics–writing relation but also factors that influence this relation. Future work is warranted to investigate mechanisms of the relation and potential practical implications.

写作和数学对于学业成就至关重要。在本研究中，我们调查了写作技能和数学技能是否相关，如果相关，它们之间的关系是否受参与者的年级水平（发展阶段的代表）、数学和写作技能的子技能以及评估特征（数学和写作任务的规范和标准化性质，以及数学和写作措施的可靠性）的调节， 使用荟萃分析。共有 211 项研究 （k = 564，N = 1,207,983） 符合纳入标准。 总体而言，数学和写作呈中等相关性 （r = .48）。它们关系的总体幅度随年级水平而变化，因此与大学及以上年级的学生相比，小学年级学生的关系更强。当通过高阶和低阶写作和数学技能以及年级进行探索时，低阶写作和数学 （.59） 和高阶写作和数学 （.48） 在小学年级有很大关系，而高阶写作和数学在成年期 （.25） 的相关性较弱。这种关系也因数学任务的可靠性而异，因此可靠性较高的数学任务的大小更强。对于写作，与非规范和标准化的任务相比，写作任务的关系更强。这些结果不仅证实了数学-写作关系，还证实了影响这种关系的因素。未来的工作是必要的，以研究这种关系的机制和潜在的实际影响。