http://info.edmentum.com/EducationCity-8xTableSong.html?mkt_tok=3RkMMJWWfF9wsRonvanAdu%2FhmjTEU5z14ukrWKKygYkz2EFye%2BLIHETpodcMTcBgMbDYDBceEJhqyQJxPr3CJNAN1Md%2BRhLhAQ%3D%3D

If you are having trouble with subtraction with regrouping, perhaps this will help!

Watch the videos, and try the practice.

http://www.khanacademy.org/math/arithmetic/addition-subtraction/sub_borrowing/v/basic-regrouping-or-borrowing-when-subtracting-three-digit-numbers

LZ1583

Quick Link for Subtraction Using Number LIne.  You must link to LearnZillion.com first.

Rounding to 10: LZ1786