Key to Algebra:

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.

Key to Decimals:

Key to Fractions:

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.

Key to Geometry:

Individual Books: 1, 2, 3, 4, 5, 6, 7, 8
Answer 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.

Key to Measurement:

Key to Metric Measurement:

Individual Books: 1, 2, 3, 4
Answer Keys: 1-4


A 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.

Key to Percents: