Books 8-10 extend coverage to the real number system. Key to Decimals begins with basic concepts and operations on decimals. Then it covers real-world uses of decimals in pricing, sports, metrics, calculators, and science. Key to Decimals' success-oriented approach builds confidence and independence. Key to Fractions covers all topics from basic concepts to mixed numbers and is written with secondary students in mind.
Minimal reading is required, so students can easily work independently or in small groups.
Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps and are prompted to form their own generalizations. When they finish, students have been introduced to 134 geometric terms and are ready to tackle formal proofs. Then students are taught to solve percent problems using equal fractions and decimal multiplication. Finally, percents are used to solve word problems in a variety of applications.