17987 ÷ 9 = 1998 R5
Let's divide 17987 by 9.

Step 1:
9 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 1 to get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 9

Step 2:
9 goes into 17 1 times with a remainder of 8.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 9 from 17 to get 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 9

Step 3:
9 goes into 89 9 times with a remainder of 8.
Write down 9 as next digit of of the result. 
Result so far: 19
Subtract 81 from 89 to get 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 9

Step 4:
9 goes into 88 9 times with a remainder of 7.
Write down 9 as next digit of of the result. 
Result so far: 199
Subtract 81 from 88 to get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 9

Step 5:
9 goes into 77 8 times with a remainder of 5.
Write down 8 as next digit of of the result. 
Result so far: 1998
Subtract 72 from 77 to get 5.

The final result is 1998 with a remainder of 5.