This workbook was designed as an easy-to-read, slower-paced text for students who have learning, reading, and language problems. As one of five workbooks to aid low achievers in problem solving, it focuses on using estimation to figure out what an answer to a mathematical problem might be. How to estimate using rounding and how to obtain a closer estimate are stressed. Questions within the text repeatedly involve the students' attention, and their learning is checked and reviewed within each lesson. Word problem situations reflect mathematical problems that students might actually meet. Worksheets to accompany the workbook are available in the teacher's guide. The five units in the workbook are entitled: What's Your Estimate?, Easy Numbers, Getting Close Estimates, Easy Fractions, and Easy Decimals, Easy Percents. A page on Estimation Reminders, with a list of things to remember and some examples, is also included. (MNS)