We look at the division of 13125800 by 387 
The aim is to understand the frequency of 387 in 13125800.

Step 1:
1 divided by 387 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 387

On to step 2:
The number 387 fits into 13 0 times, leaving a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Take the next digit (1) from the dividend and append it to 13, then repeat: 131 / 387

Advancing to step 3:
If we divide 131 by 387, we get 0 and a remainder of 131.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 131 leaves us with 131.
Append the next digit (2) from the dividend to 131 and continue with: 1312 / 387

Step 4:
387 can be fit into 1312 3 times, resulting in a remainder of 151.
The next digit of our result is 3. 
Result so far: 3.0
If we take 1161 away from 1312, we end up with 151.
Fetch the next digit (5) from the dividend, attach it to 151 and continue: 1515 / 387

Moving on to step 5:
387 can be fit into 1515 3 times, resulting in a remainder of 354.
The number 3 becomes the next digit in our result. 
Result so far: 33.0
Subtract 1161 from 1515 to get 354.
Bring next digit (8) of the dividend behind the 354 and repeat the process: 3548 / 387

Advancing to step 6:
3548 divided by 387 is 9 with a remainder of 65.
The next digit of our result is 9. 
Result so far: 339.0
Subtracting 3483 from 3548 leaves us with 65.
Take the next digit (0) from the dividend and append it to 65, then repeat: 650 / 387

On to step 7:
387 can be fit into 650 1 times, resulting in a remainder of 263.
The number 1 becomes the next digit in our result. 
Result so far: 3391.0
If we take 387 away from 650, we end up with 263.
Grab the next digit (0) from the dividend, add it to 263, then carry on: 2630 / 387

Moving on to step 8:
If we divide 2630 by 387, we get 6 and a remainder of 308.
Write down 6 as next digit of the result. 
Result so far: 33916.0
Subtract 2322 from 2630 to get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Let's proceed to step 9:
The number 387 fits into 3080 7 times, leaving a remainder of 371.
The next digit of our result is 7. 
Result so far: 33916.7
If we subtract 2709 from 3080, we get 371.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3710, and continue the process.

Advancing to step 10:
3710 divided by 387 is 9 with a remainder of 227.
Put 9 as the next digit of the answer. 
Result so far: 33916.79
Subtracting 3483 from 3710 leaves us with 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

Advancing to step 11:
387 can be fit into 2270 5 times, resulting in a remainder of 335.
Use 5 as the next digit of our solution. 
Result so far: 33916.795
The remainder is 335 after subtracting 1935 from 2270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Advancing to step 12:
3350 divided by 387 is 8 with a remainder of 254.
Put 8 as the next digit of the answer. 
Result so far: 33916.7958
If we take 3096 away from 3350, we end up with 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Going ahead to step 13:
387 can be fit into 2540 6 times, resulting in a remainder of 218.
Put 6 as the next digit of the answer. 
Result so far: 33916.79586
Deduct 2322 from 2540 and we're left with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Advancing to step 14:
If we divide 2180 by 387, we get 5 and a remainder of 245.
Write down 5 as next digit of the result. 
Result so far: 33916.795865
Subtracting 1935 from 2180 leaves us with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Step 15:
If we divide 2450 by 387, we get 6 and a remainder of 128.
Put 6 as the next digit of the answer. 
Result so far: 33916.7958656
Subtracting 2322 from 2450 leaves us with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Moving on to step 16:
1280 divided by 387 is 3 with a remainder of 119.
The next digit of our result is 3. 
Result so far: 33916.79586563
Subtract 1161 from 1280 to get 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

In conclusion, the division gives 33916.79586563 with a balance of 1.19e-07.