We look at the division of 12861532 by 403 
The aim is to understand the frequency of 403 in 12861532.

Advancing to step 1:
The number 403 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 403

Advancing to step 2:
The number 403 fits into 12 0 times, leaving a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 403

Advancing to step 3:
The number 403 fits into 128 0 times, leaving a remainder of 128.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 128 to get 128.
Include the next digit (6) from the dividend after 128, then repeat: 1286 / 403

Let's proceed to step 4:
If we divide 1286 by 403, we get 3 and a remainder of 77.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 1209 away from 1286, we end up with 77.
Fetch the next digit (1) from the dividend, attach it to 77 and continue: 771 / 403

Moving on to step 5:
If we divide 771 by 403, we get 1 and a remainder of 368.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
Deduct 403 from 771 and we're left with 368.
Grab the next digit (5) from the dividend, add it to 368, then carry on: 3685 / 403

Let's proceed to step 6:
403 goes into 3685 9 times with a remainder of 58.
Record the quotient 9 as the next digit in the result. 
Result so far: 319.0
If we take 3627 away from 3685, we end up with 58.
Bring next digit (3) of the dividend behind the 58 and repeat the process: 583 / 403

Advancing to step 7:
If we divide 583 by 403, we get 1 and a remainder of 180.
Record the quotient 1 as the next digit in the result. 
Result so far: 3191.0
If we subtract 403 from 583, we get 180.
Grab the next digit (2) from the dividend, add it to 180, then carry on: 1802 / 403

Advancing to step 8:
403 goes into 1802 4 times with a remainder of 190.
The next digit of our result is 4. 
Result so far: 31914.0
Subtract 1612 from 1802 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Going ahead to step 9:
If we divide 1900 by 403, we get 4 and a remainder of 288.
Use 4 as the next digit of our solution. 
Result so far: 31914.4
If we take 1612 away from 1900, we end up with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Going ahead to step 10:
The number 403 fits into 2880 7 times, leaving a remainder of 59.
Record the quotient 7 as the next digit in the result. 
Result so far: 31914.47
The remainder is 59 after subtracting 2821 from 2880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 11:
If we divide 590 by 403, we get 1 and a remainder of 187.
Record the quotient 1 as the next digit in the result. 
Result so far: 31914.471
If we subtract 403 from 590, we get 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Moving on to step 12:
If we divide 1870 by 403, we get 4 and a remainder of 258.
Write down 4 as next digit of the result. 
Result so far: 31914.4714
If we subtract 1612 from 1870, we get 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Let's proceed to step 13:
2580 divided by 403 is 6 with a remainder of 162.
Write down 6 as next digit of the result. 
Result so far: 31914.47146
If we take 2418 away from 2580, we end up with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Going ahead to step 14:
When dividing 1620 by 403, we get 4 with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 31914.471464
Subtract 1612 from 1620 to 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.

Moving on to step 15:
403 goes into 80 0 times with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 31914.471464
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 16:
When dividing 800 by 403, we get 1 with a remainder of 397.
Write down 1 as next digit of the result. 
Result so far: 31914.47146401
Subtracting 403 from 800 leaves us with 397.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

The final result is 31914.47146401 with a remainder of 3.97e-07.