Key to Percents emphasizes mental computation and estimation skills. 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. Key to Percents assumes only knowledge of fraction and decimal computation.
Includes:

• Key to Percents Book 1: Percent Concepts
• Key to Percents Book 2: Percents and Fractions
• Key to Percents Book 3: Percents and Decimals.