Ministry of Education and Employment of Spain
Red Escolar: Numeros
Numbers have very interesting properties and we can do many tricks with them. Try several math tricks and games that you can play by yourself or with a friend.
ClassFlow
Class Flow: Mental Math
[Free Registration/Login Required] After this lesson, students will be able to solve problems using a variety of mental math strategies.
Other
Sky Server: Color
SkyServer answers why stars have different colors and shows what you can learn by studying the colors of stars, galaxies, and other objects.