The Schoolmaster's Assistant, by Thomas Dilworth, went through 68 editions between 1800 and 1850.
Arithmetic books by Warren Colburn (1793-1833) were still being reprinted nearly 60 years after his death.
A recent study on Warren Colburn: Cooper, Susan, and J. Wesley Null. "'New' ideas in old contexts: Warren Colburn and mathematics curriculum and teaching." American Educational History Journal 38.1-2 (2011): 145+