Developing+Concepts+of+Decimals+and+Precents

= Online Resources = **Base Blocks—Decimals (NLVM)** Base-ten blocks can be placed on a place-value chart. 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. **Circle 3 (NLVM)** This game challenges students to use logic as they combine decimals to add to 3. Not as easy as it sounds. **Concentration (NCTM)** This is an engaging matching game using representations of percents, fractions, and a regional model. **Fractions Bars (Archytech)** This applet develops 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. **Fraction Model—Version 3 (NCTM)** The equivalence of fraction, decimal, and percent representations in a circle, set, or rectangle model is demonstrated. **Percentages (NLVM)** 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. **Railroad Repair (PBS)** This fun activity has students repairing a railroad by choosing and combining different sized decimal pieces of railroad tracks to help get Cybertrain back to the station. **Savings Calculator (NLVM)** This applet calculates the interest and total savings balance for a wide variety of savings possibilities. Students can explore what happens with a single deposit or with regular deposits, for any specified time, at different interest rates, and with varying compounding intervals **Sequencer (Shodor)** A nice extension tool. Students investigate the effect of multiplying a number by a decimal or mixed number. Allows the user to explore sequences by inputting a starting number, a multiplier, and an add-on. **Sock** Click on directional arrows to guide the sphere into pushing the green cubes into holes that contain the decimals that will make the target number. **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.

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