As we know One d is equal to 0.1 none (1 d = 0.1 none).

To convert Deci to None, multiply your d figure by 0.1.

Example : convert 25 d to none:

25 d = 25 × 0.1 none = none

To convert None to Deci, divide your none figure by 0.1.

Example : convert 25 none to d:

25 none = 25 ÷ 0.1 d = d