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With a sample of 71 fourth-grade students at risk for mathematics learning disabilities, we investigated the relation between student accuracy in comparing the magnitude of fractions and the quality of students\u2019 explanations of those comparisons, as well as the relation between those measures and scores on a criterion test: released fraction items from the National Assessment of Educational Progress. We also considered the extent to which reasoning and language contribute to the prediction. Results indicated a significant moderate correlation between accuracy and explanation quality. Commonality analyses indicated that explanation quality accounts for little variance in National Assessment of Educational Progress scores beyond what is accounted for by traditional measures of magnitude understanding. Implications for instruction and assessment are discussed.<\/jats:p>","DOI":"10.1177\/0022219418775120","type":"journal-article","created":{"date-parts":[[2018,5,29]],"date-time":"2018-05-29T08:42:13Z","timestamp":1527583333000},"page":"181-191","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":7,"title":["Quality of Explanation as an Indicator of Fraction Magnitude Understanding"],"prefix":"10.1177","volume":"52","author":[{"given":"Lindsay","family":"Foreman-Murray","sequence":"first","affiliation":[{"name":"Peabody College, Vanderbilt University, Nashville, TN, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lynn S.","family":"Fuchs","sequence":"additional","affiliation":[{"name":"Peabody College, Vanderbilt University, Nashville, TN, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2018,5,29]]},"reference":[{"key":"bibr1-0022219418775120","doi-asserted-by":"publisher","DOI":"10.3102\/01623737027004341"},{"key":"bibr2-0022219418775120","first-page":"161","volume-title":"Advances in instructional psychology: Vol. 5. 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