Long Division
http://www.teachertube.com/viewVideo.php?video_id=41526
Adding Integers
http://www.teachertube.com/viewVideo.php?video_id=210086
Subtracting Integers
http://www.teachertube.com/viewVideo.php?video_id=102639
Adding/Subtracting Decimals
http://www.teachertube.com/viewVideo.php?video_id=161206
Adding/Subtracting Fractions
http://www.teachertube.com/viewVideo.php?video_id=9995
http://www.teachertube.com/viewVideo.php?video_id=10145
Adding/Subtracting Mixed Numbers
http://www.teachertube.com/viewVideo.php?video_id=124922
Reducing Fractions
http://www.teachertube.com/viewVideo.php?video_id=197272
Multiplying/Dividing Fractions
http://www.teachertube.com/viewVideo.php?video_id=137626
Multiplying Decimals
http://www.teachertube.com/viewVideo.php?video_id=5823
What Are Percents?
http://www.math-videos-online.com/what-are-percents-and-decimals.html
Calculating Percentage
http://www.yourteacher.com/GED/calculatingpercentage.php