51861261 ÷ 11 
We want to divide 51861261 by 11.

Moving on to step 1:
5 divided by 11 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 11

Let's proceed to step 2:
If we divide 51 by 11, we get 4 and a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 44 from 51 and we're left with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 11

Advancing to step 3:
11 can be fit into 78 7 times, resulting in a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 47.0
The remainder is 1 after subtracting 77 from 78.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 11

Advancing to step 4:
The number 11 fits into 16 1 times, leaving a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 471.0
The remainder is 5 after subtracting 11 from 16.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 11

Moving on to step 5:
11 can be fit into 51 4 times, resulting in a remainder of 7.
Record the quotient 4 as the next digit in the result. 
Result so far: 4714.0
If we take 44 away from 51, we end up with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 11

Step 6:
72 divided by 11 is 6 with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 47146.0
The remainder is 6 after subtracting 66 from 72.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 11

Let's proceed to step 7:
11 can be fit into 66 6 times, resulting in a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 471466.0
Subtracting 66 from 66 leaves us with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 11

Going ahead to step 8:
When dividing 1 by 11, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 4714660.0
Subtracting 0 from 1 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 9:
11 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 4714660.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
When dividing 100 by 11, we get 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 4714660.09
If we subtract 99 from 100, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 11:
11 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 4714660.09
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 12:
The number 11 fits into 100 9 times, leaving a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 4714660.0909
Subtract 99 from 100 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 13:
The number 11 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 4714660.0909
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 14:
100 divided by 11 is 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 4714660.090909
Subtract 99 from 100 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 15:
10 divided by 11 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 4714660.090909
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 16:
11 can be fit into 100 9 times, resulting in a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 4714660.09090909
Subtract 99 from 100 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

In conclusion, the division gives 4714660.09090909 with a balance of 1e-09.