This site has lots of interactive math lessons. We are currently practicing fractions and division and I saw lots of fun things there for the kids to practice.

<a href="http://www.coolmath.com/index.html">http://www.coolmath.com/index.html</a>

This site has topics that are specific to Everyday Math.

<a href="http://www.math.com/practice/EverydayMath.html">http://www.math.com/practice/EverydayMath.html</a>

If you prefer to have something you could print out, this website has good 4 grade level activities. You just have to go to "pre-made", click on 4th grade, and it will take you right to the available worksheets.

<a href="http://www.mathfactcafe.com/view/view.aspx?t=P&amp;g=4">http://www.mathfactcafe.com/view/view.aspx?t=P&amp;g=4</a>