Rounding Decimals
http://www.321know.com/g6-dec-round.htm

This applet gives students the chance to practice their rounding skills with decimal numbers. Students can practice rounding given decimal numbers to certain decimal place values. There are also three variety of games that students can play that test their knowledge of decimal rounding. Students can race against the clock to see how many problems they can get right in sixty seconds, time themselves to see how long it takes them to get twenty answers correct, or they can earn extra time to add to a running timer for correct answers as they try to answer as many questions as possible before the timer runs out.