Digit Sums

The Digit sums are found by adding the digits in a number and then adding again if necessary. O and 9 are equivalent in this system.
37 = 10 = 1
461 = 11 = 2

Try these yourself:-
796
6437

Some tricks you can use are cast out 9s as adding 9s to a number does not change its digit sum. You can also forget numbers that add up to 9.
So 5317 (531) add to 9 so the digit sum is 7

Vedic Maths

Vedic Maths is based on simple Indian Sutras. I will explain each sutra and give examples as to how to apply them.
By One more than the One before(Ekadhikena Purvena)
Starting from 1 all whole numbers can be generated by using By One More than the One before i.e 2, 3 etc