We divide 81011155 by 639
Our goal is to divide 81011155 by 639.

Advancing to step 1:
639 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 639

Step 2:
639 can be fit into 81 0 times, resulting in a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Grab the next digit (0) from the dividend, add it to 81, then carry on: 810 / 639

On to step 3:
639 goes into 810 1 times with a remainder of 171.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 639 away from 810, we end up with 171.
Grab the next digit (1) from the dividend, add it to 171, then carry on: 1711 / 639

On to step 4:
639 goes into 1711 2 times with a remainder of 433.
The next digit of our result is 2. 
Result so far: 12.0
If we take 1278 away from 1711, we end up with 433.
Grab the next digit (1) from the dividend, add it to 433, then carry on: 4331 / 639

Moving on to step 5:
4331 divided by 639 is 6 with a remainder of 497.
Put 6 as the next digit of the answer. 
Result so far: 126.0
If we subtract 3834 from 4331, we get 497.
Grab the next digit (1) from the dividend, add it to 497, then carry on: 4971 / 639

Moving on to step 6:
639 can be fit into 4971 7 times, resulting in a remainder of 498.
Use 7 as the next digit of our solution. 
Result so far: 1267.0
Deduct 4473 from 4971 and we're left with 498.
Take the next digit (5) from the dividend and append it to 498, then repeat: 4985 / 639

Step 7:
When dividing 4985 by 639, we get 7 with a remainder of 512.
Use 7 as the next digit of our solution. 
Result so far: 12677.0
If we subtract 4473 from 4985, we get 512.
Bring next digit (5) of the dividend behind the 512 and repeat the process: 5125 / 639

Let's proceed to step 8:
5125 divided by 639 is 8 with a remainder of 13.
The next digit of our result is 8. 
Result so far: 126778.0
Deduct 5112 from 5125 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 9:
639 goes into 130 0 times with a remainder of 130.
The number 0 becomes the next digit in our result. 
Result so far: 126778.0
If we subtract 0 from 130, we get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Step 10:
When dividing 1300 by 639, we get 2 with a remainder of 22.
The number 2 becomes the next digit in our result. 
Result so far: 126778.02
If we take 1278 away from 1300, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 11:
The number 639 fits into 220 0 times, leaving a remainder of 220.
Record the quotient 0 as the next digit in the result. 
Result so far: 126778.02
The remainder is 220 after subtracting 0 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Step 12:
2200 divided by 639 is 3 with a remainder of 283.
Write down 3 as next digit of the result. 
Result so far: 126778.0203
Deduct 1917 from 2200 and we're left with 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Let's proceed to step 13:
If we divide 2830 by 639, we get 4 and a remainder of 274.
Record the quotient 4 as the next digit in the result. 
Result so far: 126778.02034
If we take 2556 away from 2830, we end up with 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Moving on to step 14:
2740 divided by 639 is 4 with a remainder of 184.
The number 4 becomes the next digit in our result. 
Result so far: 126778.020344
If we take 2556 away from 2740, we end up with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

The final outcome is 126778.020344, with a leftover of 1.84e-05.