Kit: Key to Algebra Kit, Books 1-10Individual Books: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10Answer Keys: 1-4, 5-7, 8-10Tests: Test Book Key To Algebra offers a unique, proven way to introduce algebra to your students. New concepts are explained in simple language and examples are easy to follow; word problems relate algebra to familiar situations, helping students understand abstract concepts. Students will develop understanding by solving equations and inequalities intuitively before formal solutions are introduced.
 Kit: Key to Decimals Kit, Books 1-4 Individual Books: 1, 2, 3, 4Answer Keys: 1-4Tests: Test BookKey To Decimals offers a unique, proven way to introduce decimals to your students. New concepts are explained in simple language and examples are easy to follow; word problems relate decimals to familiar situations, helping students understand abstract concepts. Students develop understanding by progressing slowly from basic to more complex questions.
 Kit: Key to Fractions Kit, Books 1-4 Individual Books: 1, 2, 3, 4Answer Keys: 1-4Tests: Test Book Whether you're introducing fractions for the first time, or find that your students need review and additional practice, Key to Fractions covers all major topics. Written with secondary students in mind, these self-paced workbooks provide the reinforcement needed for fraction mastery. Book 1 teaches fraction concepts, Book 2 teaches multiplying and dividing, Book 3 teaches adding and subtracting, and Book 4 teaches mixed numbers. Each book has a practice test at the end.
 Kit: Key to Percents Kit, Books 1-3Individual Books: 1, 2, 3 Answer Keys: 1-3Tests: Test BookKey to Percents emphasizes mental computation and estimation skills—since most work with percents is done without pencil and paper—before moving on to solving problems using equal fractions and decimal multiplication. Word problems in a variety of applications are also included. This series assumes only knowledge of fraction and decimal computation.
 Kit: Key to Geometry Kit, Books 1-8 Individual Books: 1, 2, 3, 4, 5, 6, 7, 8Answer Keys: 1-3, 4-6, 7, 8 Key to Geometry offers a non-intimidating way to prepare students for formal geometry as they do step-by-step constructions. 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.
 Kit: Key to Measurement Kit, Books 1-4Individual Books: 1, 2, 3, 4Answer Keys: 1-4Key to Measurements is an exceptional study series for those who need to perfect their understanding of measurements. Book 1 contains interesting and fun activities related to measuring length; Book 2 focuses on length, perimeter, and area measures; Book 3 develops further the concept of area and Book 4 covers a variety of measurement topics.
 Kit: Key to Metric Measurement Kit, Books 1-4 Individual Books: 1, 2, 3, 4Answer Keys: 1-4A fantastic aide to those who need to perfect their understanding in Metric Measurements! The only system used in international commerce and communication, and one becoming more and more prevalent in the U.S, it's becoming very important to have a firm grasp on the Metric system.