We're dividing 81111910 by 800 
We're looking to find how many times 800 goes into 81111910.

Step 1:
When dividing 8 by 800, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 800

Moving on to step 2:
When dividing 81 by 800, we get 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Fetch the next digit (1) from the dividend, attach it to 81 and continue: 811 / 800

Going ahead to step 3:
800 can be fit into 811 1 times, resulting in a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 11 after subtracting 800 from 811.
Grab the next digit (1) from the dividend, add it to 11, then carry on: 111 / 800

Advancing to step 4:
800 goes into 111 0 times with a remainder of 111.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 111 leaves us with 111.
Append the next digit (1) from the dividend to 111 and continue with: 1111 / 800

Moving on to step 5:
When dividing 1111 by 800, we get 1 with a remainder of 311.
Put 1 as the next digit of the answer. 
Result so far: 101.0
Subtracting 800 from 1111 leaves us with 311.
Bring next digit (9) of the dividend behind the 311 and repeat the process: 3119 / 800

Step 6:
800 goes into 3119 3 times with a remainder of 719.
Put 3 as the next digit of the answer. 
Result so far: 1013.0
Subtracting 2400 from 3119 leaves us with 719.
Fetch the next digit (1) from the dividend, attach it to 719 and continue: 7191 / 800

Step 7:
800 goes into 7191 8 times with a remainder of 791.
The number 8 becomes the next digit in our result. 
Result so far: 10138.0
Deduct 6400 from 7191 and we're left with 791.
Grab the next digit (0) from the dividend, add it to 791, then carry on: 7910 / 800

Step 8:
If we divide 7910 by 800, we get 9 and a remainder of 710.
Record the quotient 9 as the next digit in the result. 
Result so far: 101389.0
If we subtract 7200 from 7910, we get 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

Advancing to step 9:
If we divide 7100 by 800, we get 8 and a remainder of 700.
The number 8 becomes the next digit in our result. 
Result so far: 101389.8
If we subtract 6400 from 7100, we get 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Moving on to step 10:
When dividing 7000 by 800, we get 8 with a remainder of 600.
Record the quotient 8 as the next digit in the result. 
Result so far: 101389.88
Deduct 6400 from 7000 and we're left with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

After the division, we end up with 101389.88 and a remainder of 0.6.