The Maths Essentials series is a Singapore Math workbook series written for elementary school students who need additional support in order to master key concepts, skills, and strategies. Primary 4B covers decimals, time, area and perimeter, symmetry, tessellations, and more. Each chapter contains several worksheets that teach skills through worked examples and progressive, step-by-step instruction. This workbook has not been adapted for American audiences; metric measurements are used. Answer key (line-listed) included in the back. 154 pages, softcover. Grade 4.