Early success in mathematics is important because it is a strong predictor of later achievement in school (Morgan, Farkas, & Wu, 2011), and mathematics success leads to increased college and career opportunities (Murnane, Willett, Braatz, & Duhaldeborde, 2001). Achievement in mathematics is often measured by high-stakes standardized tests such as the National Assessment of Educational Progress (National Center for Education Statistics, 2013) that rely heavily on word problems. A word problem is a mathematics calculation embedded within sentences (Powell, 2011; Riley & Greeno, 1988). To solve word problems, students use text, typically presented in English, to identify missing information, make a plan to solve the problem, and perform one or more calculations to get the solution (Powell, 2011). The language and multi-step processes inherent in word problems can pose particular difficulties for English Language Learners (ELLs; Martiniello, 2008). The purpose of this study was to investigate the efficacy of a word-problem intervention for ELLs that incorporated culturally and linguistically responsive elements, which may be an important component of word-problem interventions for ELLs. Mathematics Achievement and ELLs The term ELL refers to a wide range of students with varying linguistic, cultural, and educational backgrounds. By federal definition, ELLs' native language is a language other than English, and their level of English proficiency may impede academic achievement in classrooms where the language of instruction is English (Linquanti & Cook, 2013). English language is embedded within mathematics instruction, and ELLs often lag behind native English speakers in performance on standardized mathematics measures involving word problems at the elementary and secondary levels (Abedi & Lord,