Below are two TI-Nspire documents from Spencer Williams that show visually the operations of adding and subtracting fractions. There is also a pdf file to support the use of these in the classroom. Thanks, Spencer, for sharing these.

Students will approximate the area under a curve using Riemann sums. This will be done by utilizing a program that computes the Riemann sum as well as drawing the graphical representation. The activity concludes with students discovering that if enough Riemann sums are used, then the area under a curve can be calculated with the required degree of precision.

http://education.ti.com/educationportal/activityexchange/Activity.do?cid...

Cool Beans! This puzzle is suitable for Algebra I students (early algebra). There are 10 sets of questions. The answer for each set becomes part of the web address for the next set. Can you get to the end of the Maths Trail?

http://mathbits.com/caching/opencache1.html

A worksheet for recording answers is available here:

http://www.mathbits.com/MathBits/StudentResources/Algebra1/AlgeCachingWo...

Cool beans! You have ten sets of problems to solve. For each set, you need to correctly answer 4 questions. For each set, the final answer becomes part of the web address for the next set of questions. Can you get to the end of the Maths Trail?

The level of questions would be suitable for a middle school class.

http://mathbits.com/caching/basicopencache1.html

A worksheet for recording answers can be found here:

http://www.mathbits.com/MathBits/StudentResources/Algebra1/BasicCachingW...

Arrange the three cards so that each rider is in a correct riding position on top of a horse.

http://www.puzzles.com/PuzzlePlayground/SaddleTheHorses/SaddleTheHorses....

There is a PDF version for the classroom available here:

http://www.puzzles.com/PuzzlePlayground/SaddleTheHorses/SaddleTheHorsesP...

Not an interactive digital resource, but a very useful resource for teaching conics nonetheless. From Lou Talman.

http://clem.mscd.edu/~talmanl/PDFs/Misc/APCalculus/ConicGraphPaper.pdf

You can create your own graph paper (Cartesian, Engineering, Polar, etc) right on this website. The output is a downloadable pdf file. Very handy.
http://www.printfreegraphpaper.com/

And here is another site that has free printable graph paper:
http://incompetech.com/graphpaper/

From the NAPLAN Resources website:
"A large number of practice questions are available from this Northern Territory website. Answers are provided as well as difficulty levels for each question. Great practice for NAPLAN 2008, years 3 , 5 , 7 and 9, although they have been developed for a previous testing system."
http://www.deet.nt.gov.au/education/teaching_and_learning/assessment_sta...

From the website: "The purpose of this Blog is to keep schools and parents informed about NAPLAN 2008. This Blog is run by Kilbaha Multimedia Publishing." New material will be added daily or so, so keep checking back.
http://naplan.blogspot.com/

The powerpoint is digital and the activity is interactive. The two powerpoints are very well done - clear and profesional looking. The activity is nicely thought-out. Great job, Pam!

Powerpoints
http://pamburke74.webs.com/Presentations%20and%20Projects/AmbiguousCase....
http://pamburke74.webs.com/Presentations%20and%20Projects/LawofSines.ppt

Activity Sheet
http://pamburke74.webs.com/Presentations%20and%20Projects/ToothpicksandP...