Decimal magnitude comparison accuracy is unrelated to direction of effect judgment accuracy, indicating the errors do not stem from poor access to decimal magnitudes¶
Claim · All claims
Evidence · 1 study · associationalr2·q3
Currency · newest study 2017 · not yet checked against its sources · 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? Numbers of correct magnitude comparisons and correct direction of effect judgments were uncorrelated for both grades, including when only multiplication and division problems with operands below one were considered. → Lortie-Forgues 2017
Evidence¶
Lortie-Forgues 2017¶
Lortie-Forgues, Hugues and Siegler, Robert S (2017) Conceptual knowledge of decimal arithmetic. Journal of Educational Psychology. pp. 374-391. ISSN: 0022-0620. https://doi.org/10.1037/edu0000148
q3 · i? · associational · r2
Study 1 correlational analysis: children answered 83% of decimal magnitude comparisons correctly, yet "numbers of correct magnitude comparison and direction of effect judgments were unrelated" in both grades, and also on the below-one multiplication and division subsets (all r's n.s.).
"For both 6th and 8th graders, numbers of correct magnitude comparison and direction of effect judgments were unrelated (6th grade, r = 0.01, n.s.; 8th grade, r = 0.10, n.s.)."
Discussion¶
Learner Variables¶
- Number Sense — predictor: learners who differ on it differ in outcomes
Related Claims¶
- Below Chance Direction Of Effect Decimals Below One
- Explanations citing both the arithmetic operation and the operands' magnitudes are strongly associated with accurate direction of effect judgments, while unconditional operation rules are associated with very low accuracy — related
- Both symbolic and nonsymbolic magnitude processing correlate with subtraction accuracy, but subtraction speed is associated only with symbolic tasks — related
- Below-chance direction of effect judgments with decimals below one are not attributable to weak decimal computation skill — related
- Direction of effect judgments for multiplication of decimals below one are more accurate when one operand is a whole number than when both operands are decimals — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
decimal-magnitude-comparison-unrelated-direction-of-effect |
title |
Decimal magnitude comparison accuracy is unrelated to direction of effect judgment accuracy, indicating the errors do not stem from poor access to decimal magnitudes |
description |
Decimal magnitude comparison accuracy is unrelated to direction of effect judgment accuracy, indicating the errors do not stem from poor access to decimal magnitudes |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2017 |
generated |
by process:wiki-ingest on 2026-10-23 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — lortie-forgues-2017 |
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