The development of number line estimation in children at risk of mathematics learning difficulties: A longitudinal study.

Children with mathematics learning difficulties (MLD) show poorer performance on the number line task, but how performance on this task relates to other mathematical skills is unclear. This study examined the association between performance on the number line task and mathematical skills during the first 2 years of school for children at risk of MLD. Children (N = 100; Mage = 83.63 months) were assessed on four occasions on the number line task and other mathematical skills (math fluency, numerical operations, and mathematical reasoning). Estimation patterns were analyzed based on the representational shift and proportional judgment accounts separately. More consistent longitudinal trends and stronger evidence for differences in mathematical skills based on estimation patterns were found within the representational shift account. Latent growth curve models showed accuracy on the number line task as a predictor of growth in some mathematical skills assessed. We discuss impacts of methodological limitations on the study of estimation patterns.

Heterogeneity in children at risk of math learning difficulties.

This study recruited 428 Singaporean children at risk of math learning difficulties (MLD; Mage  = 83.9 months, SDage  = 4.35 months; 41% female). Using a factor mixture model that considered both quantitative and qualitative differences in math ability, two qualitatively different groups were identified: one with generalized difficulties across different math skills and the other with more focal difficulties in arithmetic fluency. Reading, working memory capacity, and numeracy (number line estimation skills and numerical discrimination) uniquely explained group membership. Children within each group differed in the extent of difficulties they exhibited, with numeracy variables differentially contributing to math ability in each group. Findings speak against a dimensional view of MLD and underscore the conceptual limitations of using basic numeracy performance to profile learning difficulties.

Revisión sistemática sobre intervenciones en alfabetización temprana: implicancias para intervenir en español / A systematic review on early literacy interventions: implications for interventions in Spanish

Resumen Contar con herramientas para el diseño y la implementación de intervenciones en alfabetización con niños hispanohablantes reúne cada vez mayor interés entre docentes e investigadores. Para contribuir a esta demanda, realizamos una revisión sistemática con el objetivo de sintetizar la información disponible sobre intervenciones basadas en la evidencia (IBE) con niños de primero a tercer grado escolar. Nuestros resultados recogen información sobre 20 IBE, que buscaron mejorar al menos uno de los siguientes componentes críticos nombrados por el NRP (2000): conciencia fonológica, principio alfabético, fluidez, vocabulario y comprensión. Dado que el 90% de ellos fue realizado con niños angloparlantes nos dedicamos a discutir críticamente la aplicabilidad de esta evidencia al contexto particular de países hispanohablantes. Si bien muchas de las características generales de las IBE implementadas en inglés podrían servir de guía para intervenir en español, resulta imprescindible tener en cuenta las diferencias estructurales en la ortografía de ambas lenguas. A su vez, identificamos estrategias transversales y técnicas de implementación en las IBE, que por su carácter universal podrían ser de utilidad práctica también para intervenir en el desarrollo lector en español.

Abstract An area of increasing interest amongst teachers and researchers is the availability of tools for the design and implementation of literacy interventions with Spanish speaking children. The present systematic literature review contributes to this need by summarizing available findings on evidence-based literacy interventions (EBI) for children from first to third year of primary school. Our results are based on 20 EBI that aimed at improving at least one of the critical components mentioned by the NRP (2000): phonological awareness, phonics, fluency, vocabulary and comprehension. As 90% of the studies were completed with English-speaking children, we critically discussed the applicability of this evidence to the specific context of Spanish-speaking countries. Although many of the general characteristics of the EBI completed with English speaking children could also guide interventions in Spanish, it remains crucial to take into account structural differences between the orthographies of both languages. Moreover, we identified transversal strategies and implementation techniques that due to their universal character could also be useful for early literacy interventions in Spanish.