Place Value - Decomposing for addition & subtraction

This applet is designed for teachers to use as a challenge environment with their students.[br][br]Some of the issues that can be explored with this applet include -[br][br][b]place value[br]estimation[br]"borrowing" and "carrying"[br][br][color=#ff0000][i]What questions could/would you ask your students based on this applet?[/i][/color][/b]
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Information: Place Value - Decomposing for addition & subtraction