90309 ÷ 5 = 18061 R4
Let's divide 90309 by 5.

Step 1:
5 goes into 9 1 times with a remainder of 4.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 5 from 9 to get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 5

Step 2:
5 goes into 40 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 18
Subtract 40 from 40 to get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 5

Step 3:
5 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of of the result. 
Result so far: 180
Subtract 0 from 3 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 5

Step 4:
5 goes into 30 6 times with a remainder of 0.
Write down 6 as next digit of of the result. 
Result so far: 1806
Subtract 30 from 30 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 5

Step 5:
5 goes into 9 1 times with a remainder of 4.
Write down 1 as next digit of of the result. 
Result so far: 18061
Subtract 5 from 9 to get 4.

The final result is 18061 with a remainder of 4.