Explore percents with this easy reference guide. Learn how to convert fractions to percents and percents to fractions. Try the sliding bar to see how a percentage is calculated. Detailed explanations and examples are included.

In this lesson, young scholars use chocolate bars to explore adding fractions with unlike denominators.

Half-length practice test for the third grade OAT (Ohio Achievement Test). The test includes 17 multiple-choice and 3 open-response question dealing with topics such as measurement (unit conversion, time), geometry (volume, area), data...

In these KQED Lowdown infographics, explore how adult obesity rates in the United States, as measured by body mass index (BMI), have dramatically changed in the past half-century. A circular graph and a pictograph depict data by decade,...

Explains what quartiles are and some different contexts in which they are used. Includes ten practice questions.