Source: Repeating decimal - Wikipedia

I need to determine the length of a repeating decimal, but I cannot get the precise answer with Javascript.
Do you have an idea how to calculate it?
I am solving the problem 26 of Euler Project.
Source: https://www.freecodecamp.org/learn/project-euler/project-euler-problems-1-to-100/problem-26-reciprocal-cycles
             
            
              
              
              
            
            
           
          
            
              
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              dividing only is not going to work, JavaScript doesn’t do precision with that many decimals
you probably need to do smaller steps in that division, so that you get a precise result there
             
            
              
              
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