There are 16 sutras and equal number of upa-sutras discovered from Atharvaveda by Swami Bharati krishna tirthji during 1914 to 1918
Sutras are the few words in Sanskrit but when applied in the context of mathematical methods ,it gives the methods of solving problems logically with one line answer.
All sutras can be used in different branches of mathematics like number theory, algebra, trigonometry ext.