What is two decimals equivalent to o.9

You can add as many zeros to the right most side of a decimal without changing its value. But you can't add as mant zeros on the left side after the decimal. So, 0.9 can also be written as 0.90000000000000 or even 0.90. BUT, it canmot be written as 0.0009 or 0.09.

It is important because sometimes ur dna needs to multiply