Middle-School (grades 5 through 9) math program written to provide skills in context. Students write and solve simple algebra problems, then manipulate the vertices of an on-screen triangle so that it matches given information about its angles. Sample problem: "Make triangle ABC so that mCBA = 30° and the mBAC is twice the mBCA."

Middle-School (grades 5 through 9) math program written to provide skills in context. Students locate points on a number line. Problems deal with fractions, decimals, square roots, and/or absolute values.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students are shown eight fraction representations and must choose three that add up to a given sum. Fractions are halves, fourths, and eighths.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students must place four quarters, four dimes, four nickels, and four pennies on a 4 by 4 grid so that the rows and columns sum to given values. The program generates hundreds of problems on two levels of difficulty.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students classify triangles based on sides and angles.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students choose one of two types of problems: ruler fractions (halves, fourths, eighths, sixteenths) or regular fractions. Students must add the given three fractions. Every problem is illustrated with an interactive sketch.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students use mental math and proportional thinking to find common percentages (10% 5% 1% 15%, etc.) of a given number.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students are shown a Cartesian plane across which a small dot moves. Students try to "capture" the dot by typing in its current or anticipated coordinates.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students balance a beam by using positive and negative weights.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students use coordinate graphing to guide a moving dot through a series of mazes. Think: coordinate graphing pinball.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students manipulate weights on two balance beams to solve two simultaneous equations.

Middle-School (grades 5 through 9) math program written to provide skills in context. Students use hints to find what fraction of a pizza was eaten by each of five party-goers. Sample hints: "Judy had 2/5 of a pizza. Bill ate twice as much pizza as Judy."

Middle-School (grades 5 through 9) math program written to provide skills in context. Students calculate the probability of three different types of outcomes on a slot machine: three apples, at least one apple, or no apples.