We look at the division of 12231357 by 13 
We want to divide 12231357 by 13.

Step 1:
When dividing 1 by 13, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 13

Advancing to step 2:
12 divided by 13 is 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Append the next digit (2) from the dividend to 12 and continue with: 122 / 13

Going ahead to step 3:
When dividing 122 by 13, we get 9 with a remainder of 5.
The next digit of our result is 9. 
Result so far: 9.0
The remainder is 5 after subtracting 117 from 122.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 13

On to step 4:
The number 13 fits into 53 4 times, leaving a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 94.0
Deduct 52 from 53 and we're left with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 13

Let's proceed to step 5:
When dividing 11 by 13, we get 0 with a remainder of 11.
Use 0 as the next digit of our solution. 
Result so far: 940.0
Deduct 0 from 11 and we're left with 11.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 13

Let's proceed to step 6:
13 goes into 113 8 times with a remainder of 9.
Use 8 as the next digit of our solution. 
Result so far: 9408.0
If we take 104 away from 113, we end up with 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 13

Going ahead to step 7:
The number 13 fits into 95 7 times, leaving a remainder of 4.
The next digit of our result is 7. 
Result so far: 94087.0
The remainder is 4 after subtracting 91 from 95.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 13

Advancing to step 8:
The number 13 fits into 47 3 times, leaving a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 940873.0
If we subtract 39 from 47, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
13 can be fit into 80 6 times, resulting in a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 940873.6
Subtracting 78 from 80 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 10:
If we divide 20 by 13, we get 1 and a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 940873.61
Subtract 13 from 20 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 11:
When dividing 70 by 13, we get 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 940873.615
Subtracting 65 from 70 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 12:
The number 13 fits into 50 3 times, leaving a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 940873.6153
Subtract 39 from 50 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 13:
13 can be fit into 110 8 times, resulting in a remainder of 6.
The next digit of our result is 8. 
Result so far: 940873.61538
Deduct 104 from 110 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 14:
13 goes into 60 4 times with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 940873.615384
If we take 52 away from 60, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 15:
The number 13 fits into 80 6 times, leaving a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 940873.6153846
The remainder is 2 after subtracting 78 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 16:
When dividing 20 by 13, we get 1 with a remainder of 7.
The next digit of our result is 1. 
Result so far: 940873.61538461
Subtract 13 from 20 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final result is 940873.61538461 with a remainder of 7e-09.