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Tool: Base 10 Addition Mathlets
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Go to: http://www.commoncoremathlets.com/Base10AdditionMathlets.html (opens a new window)
Description: The idea for the one, two, and three place addition mathlets is to show the steps in the base ten addition procedure in conjunction with a model. Each time the mathlet is run (by clicking the "New" button) a randomly generated problem is presented in both forms. Each click of the addition button shows one "step", i.e. for one place value, in the process. So the first click shows the one’s place addition with a possible carry. The second show the ten's place addition, if any, and the third click, if necessary, shows the hundred's place addition, and the fourth click, if required, adds the thousands. Between steps the addition button changes color to indicate it is ready for the next step.
Technology Type: JavaScript 
Guide: User's Guide (opens a new window)
Author: Dave Posner
Language: English 
Cost: Does not require payment for use

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Courses: Math 1 Operations with numbers, Addition
Math 2 Operations with numbers, Addition
Math 3 Operations with numbers, Addition