Step 1:
The first step to converting 405990 to a fraction is to re-write 405990 in the form p/q where p and q are both positive integers. To start with, 405990 can be written as simply 405990/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 405990, which in this case is 0. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 405990/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 405990/1 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 405990 as a fraction:
405990/1 / 1