Whole+Number+Place+Value+Concepts

= Online Resources =

**Ask Dr.Math (Math Forum)** This link leads to part of Math Forum's "Ask Dr. Math" feature within their website. It contains a list of interesting questions about place value, sent in by students, which have been answered by Dr. Math. **Base-Ten Blocks (NLVM)** There are several variations of the basic base-ten blocks applet here. Blocks appear on a place-value chart and can be grouped or broken apart. The addition and subtraction versions pose problems and allow blocks in two colors to model two separate numbers. **Comparison Estimator (Shodor)** Two sets of small objects are shown and the task is to decide which set has more. The actual counts are then given. The same applet also allows for comparisons of length and areas. **Hundreds Board and Calculator (NCTM)** A calculator is used to create skip-counting patterns on a hundreds chart. You can start the pattern on any number and skip by any number. The chart extends to 1000. A second pattern will show with red dots on top of the first pattern. **The 100th Day of School** The book, //The 100th Day of School,// is a popular one to help young students begin to understand place value. This site was posted by the illustrator of the book, Joan Holub, and contains hundreds of ideas and links for celebrating the 100th day of school in the primary grades. **Key Concepts in Place Value** This site acts as an entire independent lesson on place value. It begins with a "First Glance" tutorial, then moves to a more "In-Depth" explanation of key concepts in place value, and concludes with an interactive "Practice" session for students. **Lots of Dots and a Million Dots on One Page** These explorations of big numbers are only a hint at the array of ideas found on this website. A lot is beyond the elementary school, but anyone interested in big numbers and measures will certainly be intrigued. See a dot for every second of the day! **The MegaPenny Project** A fascinating look at large numbers in terms of stacks of pennies. Stacks from 1 penny to a trillion pennies are shown with visual referents, value, weight, height if stacked, and more. Great for large-number concepts. **The Place Value Game (Jefferson Lab)** The goal is to make the largest possible number from the digits the computer gives you. Digits are presented one at a time. The player must place the digit in the number without knowing what the next digits will be. It’s fun and also good for understanding ordering of numbers. **Printable Activities Relating to Place Value** For elementary teachers, this link provides several printable activities relating to place value. The activities would be appropriate for second through fifth graders. .

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