8999 ÷ 7 = 1285 R4
We're going to perform division on 8999 with 7 as the divisor.

Step 1:
7 goes into 8 1 times with a remainder of 1.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 7 from 8 to get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 7

Step 2:
7 goes into 19 2 times with a remainder of 5.
Write down 2 as next digit of of the result. 
Result so far: 12
Subtract 14 from 19 to get 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 7

Step 3:
7 goes into 59 8 times with a remainder of 3.
Write down 8 as next digit of of the result. 
Result so far: 128
Subtract 56 from 59 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 7

Step 4:
7 goes into 39 5 times with a remainder of 4.
Write down 5 as next digit of of the result. 
Result so far: 1285
Subtract 35 from 39 to get 4.

The final result is 1285 with a remainder of 4.