STANDARDS ALIGNMENT: Grades 1–5. This applet gives students practice in figuring the correct change when making a purchase with bills of different denominations. Students may solve problems at four levels of difficulty using currencies from five different countries. (sw/js)

STANDARDS ALIGNMENT: Grades 1-7. This site comprises six activities including defining a fraction, finding equivalent fractions, adding fractions, and multiplying fractions. Students may respond online to get immediate feedback, or they can work the examples on grid paper. (sw/js)

Reduce fraction anxiety, called Fractionitis, in adults and students by interacting with fractions using the applets at this site. See Main Categories on the left side of the home page for interactive fraction and mixed number problems. Also included are short games where the user guesses fractional parts of a hedge while trying to find the location of Grampy's and then Granny's various hiding places. (Author/pk/js)

STANDARDS ALIGNMENT: Grades 3-7. Power cards are a device for guessing secret numbers. The 5-card set described at this site can be used for numbers up to 31 and is especially useful for guessing birthdays. Young students will have fun figuring out the "trick," while middle grades students can reinforce their understanding of place value by learning the binary numeration system, the basis of the power cards. Both an applet and a print version of the activity are included. (sw/js)

STANDARDS ALIGNMENT: Grades 2-4. In this first of two activities, virtual hundred boards and calculators present a visual way to examine patterns and relationships among numbers. Skip counting patterns are displayed on a calculator and on a hundred board simultaneously. (author/sw/js)

STANDARDS ALIGNMENT: Grades 2-4. In this second of two activities, students use virtual hundreds boards and calculators to skip count both forward and backward starting at various numbers. (author/sw/js)

STANDARDS ALIGNMENT: Grades 3-6. This website includes four different pattern block activities that focus on identifying fractional values in the context of arbitrarily defined unit wholes. The pattern block applet activities cause students to think about unconventional unit wholes. Students work with triangles, parallelograms, trapezoids, hexagons, and other geometric shapes to identify fractional parts of combined shapes. (sk/sw/js)

STANDARDS ALIGNMENT: Grades 3-7. When playing the online Fraction Track game, students must think about how fractions are related to a unit whole, compare fractional parts of a whole, and find equivalent fractions. This resource includes pedagogical information for the teacher. (author/sw/js)

STANDARDS ALIGNMENT: Grades 3-7. This site features a software simulation of two runners racing on a track. Students can control the speeds and starting points of the runners, watch the race, and examine a graph of the time-versus-distance relationship. Activities like this can help students in the upper elementary grades understand ideas related to functions. (author/sw/js)

STANDARDS ALIGNMENT: Grades 3-5. This applet allows students to change the size and orientation of a rectangle and a parallelogram, while preserving the essential characteristics of each shape. For example, they can easily determine that one kind of parallelogram is a rectangle, but that a rectangle cannot be converted into a parallelogram with nonright angles. (sw/js)

STANDARDS ALIGNMENT: Grades 4-6. Two applets provide practice in plotting points in all four quadrants of the Cartesian plane. With the first applet, students plot individual points, and the second challenges students to move one point to another location based on specific constraints. (sw/js)

STANDARDS ALIGNMENT: Grades 3-7. In the first of two activities, students collect, organize, and then examine weather data that have been compiled over a period of time in a spreadsheet applet. In the second activity (acailable from this link), students use the graphing functions of a spreadsheet to help them interpret the data. (author/sw/js)

STANDARDS ALIGNMENT: Grades 3–10. This introductory fractals unit, accessible to elementary and middle school students, describes what fractals are, why to study fractals, how to make fractals, and properties of fractals. The site includes applets, activities, discussion questions, and numerous links to other fractal websites. (sw/js)