http://www.worldplenty.com/g7_41_x2.htm
http://player.discoveryeducation.com/index.cfm?guidassetid=eab4d6e9-5462-44f8-8cb8-52783596cd13
7.NS.2 Multiplication and Division
7.NS.2. Apply and extend previous understandings of multiplication and division and of fractions to multiply and divide rational numbers.