87439 ÷ 9 = 9715 R4
We're going to perform division on 87439 with 9 as the divisor.

Step 1:
9 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 8 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 9

Step 2:
9 goes into 87 9 times with a remainder of 6.
Write down 9 as next digit of of the result. 
Result so far: 9
Subtract 81 from 87 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 9

Step 3:
9 goes into 64 7 times with a remainder of 1.
Write down 7 as next digit of of the result. 
Result so far: 97
Subtract 63 from 64 to get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 9

Step 4:
9 goes into 13 1 times with a remainder of 4.
Write down 1 as next digit of of the result. 
Result so far: 971
Subtract 9 from 13 to get 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 9

Step 5:
9 goes into 49 5 times with a remainder of 4.
Write down 5 as next digit of of the result. 
Result so far: 9715
Subtract 45 from 49 to get 4.

The final result is 9715 with a remainder of 4.