http://www.michaelbach.de/ot/index.html

http://www.echalk.co.uk/amusements/OpticalIllusions/illusions.htm

basic skills, measurement, geometry, time, money, fractions, probability

http://www.brainpopjr.com/math/

http://www.mrnussbaum.com/mathcode.htm

basic skills, fractions, percents, decimals, data, geometry

http://www.bbc.co.uk/schools/ks2bitesize/maths/

basic skills, fractions, place value, time, money, measurement

http://www.sheppardsoftware.com/math.htm

basic skills, fractions, decimals, mean median mode, geometry, percents, money, measurement

http://www.gameclassroom.com/

basic skills, money,place value, decimals, fractions, prime factors, GCF, LCM, distance and angles,

http://www.e-learningforkids.org

math games

http://illuminations.nctm.org/Activities.aspx?grade=2&grade=3

Basic skills, fractions, mixed skills, time, geometry, algebra

http://www.kidsnumbers.com/

basic skills, decimals, capacity, equations, fractions, geometry, money, integers, percentages, ratios, sequences, weight, probl

http://primarygamesarena.com/Maths

K-12 math games

http://www.supermathsworld.com/

Read a story and do math computations in order to solve the mystery

http://teacher.scholastic.com/maven/index.htm

convert fractions, decimals, and percents

http://www.mathgoodies.com/lessons/vol4/challenge_vol4.html