Such shrines and temples became a place where people gathered to present and solve mathematical problems; some dedicated sangaku with difficult problems without answers written on them, and others who solved such problems dedicated their own sangaku with answers to problems dedicated earlier.
やがて、人の集まる神社仏閣を数学の発表の場として、難問や問題だけを書いて解答を付けずに奉納するものも現れ、その問題を見て解答を算額にしてまた奉納するといったことも行われた。