Step 1:
The first step to converting 641673508.80906 to a fraction is to re-write 641673508.80906 in the form p/q where p and q are both positive integers. To start with, 641673508.80906 can be written as simply 641673508.80906/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 641673508.80906, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 641673508.80906/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 641673508.80906/1 each by 100000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 641673508.80906 as a fraction:
641673508/1 / 1