This is a math word problem karuta game planned and supervised by Mr. Hiroshi Tanaka of Tsukuba University Elementary School. This product is new. Players play by combining word problems with diagrams, pictures, or equations and diagrams. Working on it alone can help develop the ability to understand what the word problem is asking. If it's difficult to understand with the diagrams, looking at the pictures on the back will help with thinking. It contains 36 yellow cards, 36 green cards, 36 blue cards, for a total of 108 cards.