86243 ÷ 5 = 17248 R3
Let's divide 86243 by 5.

Step 1:
5 goes into 8 1 times with a remainder of 3.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 5 from 8 to get 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 5

Step 2:
5 goes into 36 7 times with a remainder of 1.
Write down 7 as next digit of of the result. 
Result so far: 17
Subtract 35 from 36 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 5

Step 3:
5 goes into 12 2 times with a remainder of 2.
Write down 2 as next digit of of the result. 
Result so far: 172
Subtract 10 from 12 to get 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 5

Step 4:
5 goes into 24 4 times with a remainder of 4.
Write down 4 as next digit of of the result. 
Result so far: 1724
Subtract 20 from 24 to get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 5

Step 5:
5 goes into 43 8 times with a remainder of 3.
Write down 8 as next digit of of the result. 
Result so far: 17248
Subtract 40 from 43 to get 3.

The final result is 17248 with a remainder of 3.