We're dividing 13099301 by 631 
The aim is to understand the frequency of 631 in 13099301.

Step 1:
1 divided by 631 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 631

Advancing to step 2:
631 can be fit into 13 0 times, resulting in a remainder of 13.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 13 leaves us with 13.
Fetch the next digit (0) from the dividend, attach it to 13 and continue: 130 / 631

Step 3:
When dividing 130 by 631, we get 0 with a remainder of 130.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 130, we get 130.
Grab the next digit (9) from the dividend, add it to 130, then carry on: 1309 / 631

Advancing to step 4:
1309 divided by 631 is 2 with a remainder of 47.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 1262 from 1309 and we're left with 47.
Grab the next digit (9) from the dividend, add it to 47, then carry on: 479 / 631

Advancing to step 5:
When dividing 479 by 631, we get 0 with a remainder of 479.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
Subtracting 0 from 479 leaves us with 479.
Fetch the next digit (3) from the dividend, attach it to 479 and continue: 4793 / 631

Let's proceed to step 6:
When dividing 4793 by 631, we get 7 with a remainder of 376.
Record the quotient 7 as the next digit in the result. 
Result so far: 207.0
Subtract 4417 from 4793 to get 376.
Bring next digit (0) of the dividend behind the 376 and repeat the process: 3760 / 631

On to step 7:
When dividing 3760 by 631, we get 5 with a remainder of 605.
Write down 5 as next digit of the result. 
Result so far: 2075.0
Deduct 3155 from 3760 and we're left with 605.
Grab the next digit (1) from the dividend, add it to 605, then carry on: 6051 / 631

On to step 8:
When dividing 6051 by 631, we get 9 with a remainder of 372.
The number 9 becomes the next digit in our result. 
Result so far: 20759.0
If we subtract 5679 from 6051, we get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Step 9:
The number 631 fits into 3720 5 times, leaving a remainder of 565.
Record the quotient 5 as the next digit in the result. 
Result so far: 20759.5
If we subtract 3155 from 3720, we get 565.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

Advancing to step 10:
When dividing 5650 by 631, we get 8 with a remainder of 602.
The number 8 becomes the next digit in our result. 
Result so far: 20759.58
Subtract 5048 from 5650 to get 602.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6020, and continue the process.

Let's proceed to step 11:
631 goes into 6020 9 times with a remainder of 341.
Use 9 as the next digit of our solution. 
Result so far: 20759.589
The remainder is 341 after subtracting 5679 from 6020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Step 12:
The number 631 fits into 3410 5 times, leaving a remainder of 255.
Put 5 as the next digit of the answer. 
Result so far: 20759.5895
Subtract 3155 from 3410 to get 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Moving on to step 13:
631 can be fit into 2550 4 times, resulting in a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 20759.58954
Subtract 2524 from 2550 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 14:
If we divide 260 by 631, we get 0 and a remainder of 260.
Use 0 as the next digit of our solution. 
Result so far: 20759.58954
Deduct 0 from 260 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 15:
When dividing 2600 by 631, we get 4 with a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 20759.5895404
If we take 2524 away from 2600, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 16:
If we divide 760 by 631, we get 1 and a remainder of 129.
The number 1 becomes the next digit in our result. 
Result so far: 20759.58954041
If we subtract 631 from 760, we get 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

After the division, we end up with 20759.58954041 and a remainder of 1.29e-07.