Step 1:
The first step to converting 645939 to a fraction is to re-write 645939 in the form p/q where p and q are both positive integers. To start with, 645939 can be written as simply 645939/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 645939, which in this case is 0. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 645939/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 645939/1 each by 1:
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 645939 as a fraction:
645939/1 / 1