Billingual Skill Building Series – Grades 1-3 Build Their Language & Math Skills in Spanish & English Here is a ready-to-use reading, writing and math practice series, in English, for Spanish Immersion. ESL, SSL and ELL students. Parents and teachers can use these books to teach, review and reinforce basic language skills in one or both languages. The easy-to-use format provides Spanish content and corresponding English content on adjacent pages. Comprised of curriculum-based material, thes workbooks are ideal for both first and second language learners. Answer key included. 64 pages.