This PDF has a list of movement options that will get kids moving during transitions or when they need to wiggle. Be aware that it's a long document, so check to be sure you want all of it before you print. Thanks, Sam, for sharing the find!
This would be a great link between odd/even numbers and multiples. Advanced just moves faster.
This site has lots of interesting links which will build on all of the multiple intelligences.
Select either 1/2 - 1/4 or 1/4 - 1/8 and play a fun game of flower fractions. You can play against the computer, or there's also a two player option.
This one is tough, but it can easily be related to comparing numbers.
This is the only site I've ever seen that lets kids practice their skills with naming fractions as part of a set, part of a whole, and on a number line. They get it!
This site has many free pictures that can be used for multimedia presentations.