Where to stop in fractional binary conversion.

Hi Guys. Hope you are all doing well. This is my first hurdle with the text book.
On page 30 they explain this concept and says you must stop when the fractional part is 0 or there is enough bits.
My question is how do you know when you have enough bits. Some fractions goes on forever, like the one I tried arbitrarily(0.36).
When I do it with my binary calculator it stops at 6 digits. But when you multiply it out the way the teach you in the text book, it
goes on forever. I have read this section again and they don't exactly say where you must stop.

Do you guys have any idea. Maybe I missed something

Hi, i haven't received my study material to date but we'll keep posted with each other once I received and went through it.
Email me on. 42101271@mylife.unisa.ac.za

Wow ,are we gonna be using calculators in this module ?I hate Maths ...actually calculations .

Yes calculator are gonna be used.

In the exams no calculator is permitted. The calculations will be simple and it will be clear when to stop. Only multiple choice questions will be asked in the exams.

Thank you.