This is an AWESOME animated demonstration of surface are vs. volume. It would be a great way to start a lesson on this SLE.
This site lets kids work problems conceptually by using models. Scroll to the bottom for the part to part ratio exercises.
This site also allows you to practice finding elapsed time.
Use your knowledge of points on a plane to guide a robot through a minefield. This site uses all four quadrants.
Click on Proper Fractions (easy) for an activity that requires quick solving of multiplication of fractions times whole numbers to ten. Note that your SLE states that students must be able to MODEL multiplication of fractions, so be sure that you also provide them with experience with this.
This site allows kids to explore decimals on a number line, which makes it really easy to show how to round up or down.
Hotmath (Hans Software)
This is a coordinate plane challenge that involves all four coordinates. Enter coordinates on a plane to catch flies. Yuck, but fun!
This is a great site for modeling perfect squares and other numbers by using arrays. It shows the equations so kids can see that a perfect square only has one while other arrays have two (commutative property).
This is an awesome site that allows kids to build rectangular prisms and explore both volume and surface area.
A great site for helping kids understand what it actually means to show 1/2 OF 1/3.
Mr. Myers Classroom
This interactive clock is great to use as a teaching tool or for a well organized center. One of the 3rd grade SLEs for this quarter, elapsed time, end time unknown, is not covered in Saxon but can be taught using this manipulative.
Mrs. Glossar's Math Goodies
Learn the vocabulary and basics of diameter, radius, chord, plane, etc. Great descriptions and practice.
This blackline would be a great resource for Battleship games.
Choose Proper Fractions (Easy) for this skill. The hard version would be a great extension. Both go beyond the benchmark fractions.
This is an awesome site for teaching kids about volume. Be sure to give them blocks so they can build as you teach!