Vedic Maths - All from 9 and Last from 10

This is a very easy method for subtracting numbers from 100,1000's etc
So 1,000 - 876 is done by all from 9 and last by 10. So 8 from 9 is 1,7 from 9 is 2, and 6 from 10 is 4. So the answer is 124.
If your doing 1,000 - 36. Write 36 as 036,and then apply the rule:-964.
Try these yourself 10,000 -3,883,100-64,98