1. Ekadhikena Purvena
By one more than the previous one
2. Nikhilam Navatashcaramam
All from 9 and last from 10
3. Urdhva-Tiryagbyham
Vertically and crosswise
4. Paravartya Yojayet
Transpose and adjust
5. Shunyam Saamyasamuccaye
If the sum is same, it's zero
6. Anurupye Shunyamanyat
If one is in ratio, other is zero
7. Sankalana-vyavakalanabhyam
By addition and subtraction
8. Puranapuranabhyam
By completion or non-completion