Sulaba sutra.

Sulaba sutra is actually a portion of a larger text on mathematics known as Kalpa Sutra. These are Vedic Mathematics recognized for their developments in Arithmetic and algebra. Indians were the first to use letters of alphabets to represent the unknown. Their specialty was in geometry. The Geometrical instruments found in Indus Valley goes to prove this. The oldest known as the Pythagorean theorem was existing in the Boudhayana the earliest of the sulaba Sutra 8th century. This was however presented by Pythagoras around 540 BC after he discovered it during his travels in India. Arya bhatta in the 6th century introduced sines and reversed sines. Brahmagupta 7th century Mahavira 9th century and Bhaskara 12th century. Mahavira made great strides in the use of fractions and figuring out how to divide one fraction by another. Bhaskara made progress in spherical trigonometry and principles of calculus 500 years before Newton.
The Vedic system of math explained in the sutra reduces the no of steps in the calculation to merely a few and is still worthy of study today. the conventional method requires many more steps.