Students in Mrs. Devlin’s Class have created these voicethreads to practice subtraction, teach others how to subtract, and see if anyone has a different way. Check them out, and feel free to comment with your own method!
Subtracting Numbers without Regrouping
http://voicethread.com/book.swf?b=753061
Subtracting Numbers with One Regroup
http://voicethread.com/book.swf?b=753020
Subtracting Numbers with More than One Regroup
http://voicethread.com/book.swf?b=753017
Subtracting Numbers Across Zeros
http://voicethread.com/book.swf?b=753007
Note: We did realize that you could keep the writing from fading towards the end of the project. To see how, read how to increase writing time in voicethread.
Teaching with Technology 
Tina,
One of my Math specialists saw this and now wants to do this with his building. Thanks for your post!
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