2nd Grade

http://www.sheppardsoftware.com/math.htm

3rd and 4th

Metric Video
http://mathplayground.com/how_Metric.html

Measuring
http://www.bbc.co.uk/skillswise/e3/numbers/measuresshapespace/length/flash1.shtml

Capacity
http://primarygamesarena.com/capacity

Measurment
http://www.sheppardsoftware.com/math.htm

4th Grade

Day at the Mall
http://mathplayground.com/mathatthemalll1.html