"Sansue" = Japanese Math for Kids
Above site introduces problems of mathematics "Sansue (in Japanese)" which Japanese schoolchildren learn at elementary school. Problems are selected mainly from entrance examination problems of famous junior high schools for 6th grade Japanese schoolchildren (12 years old) to take. Highly recommended to challenge as brain-teasers for math lovers.
As of Sept. 30th, 2014, over 500 problems are posted.
