Some fun links for practicing math skills are below
integer practice
http://studymaths.co.uk/games/nastynegatives.html
adding signed numbers http://www.mathplayground.com/ASB_SpiderMatchIntegers.html
http://www.mathplayground.com/ASB_OrbitIntegers.html
ordering signed numers
http://www.mathplayground.com/numberballs.html
multiplying signed numbers http://www.mathplayground.com/ASB_IntegerWarp.html
Word problems for integers
http://www.ixl.com/math/grade-7/add-and-subtract-integers-word-problems#
http://mrnussbaum.com/stock-the-shelves-ipad.html
http://www.shodor.org/interactivate/activities/GeneralCoordinates/