Boost spelling skills with the Houghton Mifflin Harcourt Steck-Vaughn Core Skills: Spelling workbook series. Thirty lessons are included, with most word groups based upon common spelling patterns and sounds. This grade 4 workbook focuses on the spelling of vowel sounds. Engaging activities and contextual exercises encourage students to explore word meanings and use words in context. 129 perforated pages, reproducible for classroom use, softcover. Line-listed answer key included. Grade 4.