Kanakkusaram
Kaṇakkusāraṃ is a comprehensive treatise in Manipravalam (a hybrid language which combines Sanskrit lexicon and Malayalam morpho-syntax), composed in the 16th-17th century CE, dealing with elementary arithmetic and methods for solving arithmetical problems arising in the everyday life of members of an agricultural community. The book was composed by one Nīlakṇṭha; but other than the name, nothing more definite is known about the author.