856 ÷ 1 = 856 R0
Let's divide 856 by 1.

Step 1:
1 goes into 8 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 8
Subtract 8 from 8 to get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 1

Step 2:
1 goes into 5 5 times with a remainder of 0.
Write down 5 as next digit of of the result. 
Result so far: 85
Subtract 5 from 5 to get 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 1

Step 3:
1 goes into 6 6 times with a remainder of 0.
Write down 6 as next digit of of the result. 
Result so far: 856
Subtract 6 from 6 to get 0.

The final result is 856 with a remainder of 0.