Internet Links 
Activities 
http://ccins.camosun.bc.ca/~jbritton/jberatosapplet.htm  Sieve of Eratosthenes  Watch the composite numbers disappear while the prime numbers stay in the sieve. 
http://www.aplusmath.com/Games/index.html 
Neat Matho, Hidden Picture, and Concentration games 
http://www.coolmath4kids.com/mathgames/ 
Play Rush, Lemonade Stand, or any of the other cool games 
http://www.halfbakedsoftware.com/quandary/v1/examples/castaway.htm 
This is a neat maze where you need to use logic and problem solving skills. 
http://www.halfbakedsoftware.com/quandary/v1/examples/landlady.htm 
Here is another maze 
http://www.coolmath4kids.com/mathgames/arithmattack/index.html

Try to do 20 addition problems from 0 to 12 in 60 seconds 
http://www.coolmath4kids.com/mathgames/arithmattack/index.html 
Try to do 20 subtraction problems from 0 to 12 in 60 seconds 
http://www.coolmath4kids.com/mathgames/arithmattack/index.html 
Try to do 20 multiplication problems from 0 to 12 in 60 seconds 
http://www.coolmath4kids.com/mathgames/arithmattack/index.html 
Try to do 20 division problems from 0 to 12 in 60 seconds 
http://www.coolmath4kids.com/mathgames/arithmattack/index.html 
Try to do 20 random problems from 0 to 12 in 60 seconds 
http://csaweb.yonsei.ac.kr/~rhee/2000/universe/power10.html 
Click on the power of 10 you wish to view 
http://microcosm.web.cern.ch/Microcosm/P10/english/P6.html 
Use the ruler to select the power of 10 you wish to view 
http://www.mathcats.com/explore/polygonplayground.html 
Create a design that tesselates 
http://www.mathcats.com/microworlds/whatacrowd.html 
Estimate the crowd until you earn 200 points 
http://www.visualfractions.com/FindGrampy.html 
Find Grampy 10 times 
http://www.visualfractions.com/FindGrampstrict.html 
Find Grampy 10 times. Has to be a mixed number in lowest terms. 
http://www.harcourtschool.com/menus/preview/harcourt_math/activities.html 
Select one of the activities. The 3^{rd} grade concentration game is cool. 

Recommended by Parade Magazine 

Recommended by Parade Magazine 