Math made easy: Part E of Mathopedia, Level 2 contains the following skill pages:Changing Percents to Decimals and Decimals to Percents, Changing Percents to Fractions and Fractions to Percents, Three Types of Percent–Type 1-Percent of a Number is an Unknown Number, Three Types of Percent–Type 2-Percent of an Unknown Number is a Number, Three Types of Percent–Type 3-Unknown Percent of a Number is a Number, Percent of Increase and Decrease, Sales-Discounts, Tax, Simple Interest, Pictographs, Circ