Step 1:
The first step to converting 421090 to a fraction is to re-write 421090 in the form p/q where p and q are both positive integers. To start with, 421090 can be written as simply 421090/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 421090, which in this case is 0. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 421090/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 421090/1 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 421090 as a fraction:
421090/1 / 1