To multiply large numbers quickly we use the method of cross multiplication - a type of method used in vedic math. By following the method in this series of videos you will quickly and easily learn how to multiply any size quickly - not with lots of different tricks like the other methods, but by using one method only. This video looks at how to multiply large numbers, four digits and over. Become a math genius - a master at numbers! Impress your teachers and get perfect grades at Math in school be working faster than your teacher can! To donate to the tecmath channel: To support tecmath on Patreon: To buy tecmath mechandise: