Rational-number CCS test performance is predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span¶

Claim · All claims
Evidence · 1 study · associational r? · q3
Currency · newest study 2019 · checked against its sources 2026-10-18 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

Reading the evidence codes

q is the design tier, i the impact, n the sample, and the kind with its r the rigour judged within that kind: what each code means.

This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.

q3 i? In Study II, a test of the rational number CCS was predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span. → Morra 2019

Evidence¶

Morra 2019¶

Morra, S.; Bisagno, E.; Caviola, S.; Delfante, C.; Mammarella, I. C. (2019). Working Memory Capacity and the Development of Quantitative Central Conceptual Structures. Cognition and Instruction. https://doi.org/10.1080/07370008.2019.1636797

q3 · i? · associational · r?

Study II examined 92 sixth- and seventh-graders. The article reports that "a test of the rational number CCS was predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span." No effect sizes or test statistics are printed.

"Study II, with 92 sixth- and seventh-graders, found that a test of the rational number CCS was predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span."

Discussion¶

Learner Variables¶

Working Memory — predictor: learners who differ on it differ in outcomes

Two subsets of rational-number CCS items demand working memory capacities of 4 or 5 units respectively — related
Verbal working memory directly and positively predicts math performance in grades 3 and 4 — a broader claim this one bears on
Children's understanding of whole number advances by one developmental level per additional unit of working memory capacity — related
Understanding rational numbers is not indiscriminately difficult for students — related

Page metadata

Field	Value
`type`	`claim`
`id`	`rational-number-ccs-predicted-by-wm-and-intrusions`
`title`	`Rational-number CCS test performance is predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span`
`description`	`Rational-number CCS test performance is predicted by working memory capacity and, to a lesser extent, by intrusion errors in the listening span`
`status`	`review`
`evidence_strength`	`moderate`
`newest_evidence`	`2019`
`source_checked`	`2026-10-18`
`generated`	by `process:wiki-ingest` on `2026-10-18`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `morra-2019`

Frontmatter is the page's machine-readable record — see the Schema & Guide.