• Base Blocks---Decimals
Base-ten blocks can be placed on a place-value chart the same as for whole number. The number of decimal places can be selected, thus designating any of the four blocks as the unit. Addition and subtraction problems can be created or can be generated randomly by the applet.

• Fraction Bar Applet
A very nice applet for developing the relationships among fractions, decimals, and percents. Bars for one whole are displayed and can be partitioned according to selected fraction, decimal, or percent values and then labeled in any of these representations. This makes equivalencies easy to explore without being too leading.

• Fraction Model---Version III
The equivalence of fraction, decimal, and percent representations in a circle, set, or rectangle model is demonstrated. Versions 1 and 2 are the same but the numerators and denominators are restricted to 20.

• Funschool.com
The Funschool website consists of mathematical games on number concepts and operations, fractions, decimals, percents, geometry, probability, patterns, and equations.

• Mathematics Teaching Cases and Facilitator's Discussion Guide
From Carne Barnett, Donna Goldenstein, & Babette Jackson, eds., (1994). Fractions, Decimals, Ratios, and Percents: Mathematics Teaching Cases and Facilitator's Discussion Guide, Portsmouth, NH: Heinemann. These excerpts, which are case studies of teachers reflecting on their teaching of decimals and percents, were reprinted with permission of WestEd Laboratory for Educational Research and Development.

• Percentages
The user enters any two of the values---whole, part, and percent---and clicks on Compute. Although the computer does the work, the applet nicely models percent problems.

• Teaching Ideas
This site provides teachers with links to ideas for teaching decimals to intermediate and upper elementary students. The user can select a topic and an age range and then is provided with ideas for teaching techniques. The information includes a good visual that could be used with students.

• Virtual Manipulatives
An excellent resource, providing background information, lesson plans, and other documents relating to the use of virtual manipulatives when teaching fractions, decimals, and percents. The site allows the user to click on and use the manipulatives within the site.