Counting backwards interractive activities

http://www.mathsisfun.com/numbers/fill-missing.php?g=100m1&name=Skip%20Counting%20Backwards%20(100%20to%201)

http://classroom.jc-schools.net/basic/math-count.html (This is a mixture of games)

http://nz.ixl.com/math/year-2
(another mixture of games)

http://nz.ixl.com/math/year-3
(another mixture of games