In this lesson on Vedic Math, you'll learn how to find digit sums of numbers using quick and easy methods. The digit sum is found by adding the digits of a number and compressing it down to a single digit number. Additionally, the technique of casting out the nines is introduced, where the number 9 is equivalent to 0 for digit sum purposes. These foundational pieces will help with addition and subtraction, and there are other applications later on.
Quick and easy ways to find digit sums.