81550208 divided by 387 
The aim is to understand the frequency of 387 in 81550208.

Moving on to step 1:
387 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 387

Going ahead to step 2:
387 goes into 81 0 times with a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Grab the next digit (5) from the dividend, add it to 81, then carry on: 815 / 387

Going ahead to step 3:
387 goes into 815 2 times with a remainder of 41.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 41 after subtracting 774 from 815.
Fetch the next digit (5) from the dividend, attach it to 41 and continue: 415 / 387

On to step 4:
When dividing 415 by 387, we get 1 with a remainder of 28.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Deduct 387 from 415 and we're left with 28.
Append the next digit (0) from the dividend to 28 and continue with: 280 / 387

Moving on to step 5:
When dividing 280 by 387, we get 0 with a remainder of 280.
Put 0 as the next digit of the answer. 
Result so far: 210.0
The remainder is 280 after subtracting 0 from 280.
Fetch the next digit (2) from the dividend, attach it to 280 and continue: 2802 / 387

Advancing to step 6:
The number 387 fits into 2802 7 times, leaving a remainder of 93.
The next digit of our result is 7. 
Result so far: 2107.0
If we subtract 2709 from 2802, we get 93.
Append the next digit (0) from the dividend to 93 and continue with: 930 / 387

Going ahead to step 7:
If we divide 930 by 387, we get 2 and a remainder of 156.
The number 2 becomes the next digit in our result. 
Result so far: 21072.0
Subtract 774 from 930 to get 156.
Include the next digit (8) from the dividend after 156, then repeat: 1568 / 387

Moving on to step 8:
1568 divided by 387 is 4 with a remainder of 20.
Use 4 as the next digit of our solution. 
Result so far: 210724.0
The remainder is 20 after subtracting 1548 from 1568.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 9:
387 can be fit into 200 0 times, resulting in a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 210724.0
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 10:
2000 divided by 387 is 5 with a remainder of 65.
The next digit of our result is 5. 
Result so far: 210724.05
If we subtract 1935 from 2000, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 11:
If we divide 650 by 387, we get 1 and a remainder of 263.
The number 1 becomes the next digit in our result. 
Result so far: 210724.051
If we subtract 387 from 650, we get 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Step 12:
387 can be fit into 2630 6 times, resulting in a remainder of 308.
Write down 6 as next digit of the result. 
Result so far: 210724.0516
The remainder is 308 after subtracting 2322 from 2630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Going ahead to step 13:
387 goes into 3080 7 times with a remainder of 371.
The next digit of our result is 7. 
Result so far: 210724.05167
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.

Going ahead to step 14:
387 can be fit into 3710 9 times, resulting in a remainder of 227.
Put 9 as the next digit of the answer. 
Result so far: 210724.051679
The remainder is 227 after subtracting 3483 from 3710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

On to step 15:
The number 387 fits into 2270 5 times, leaving a remainder of 335.
The number 5 becomes the next digit in our result. 
Result so far: 210724.0516795
Deduct 1935 from 2270 and we're left with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Let's proceed to step 16:
The number 387 fits into 3350 8 times, leaving a remainder of 254.
Put 8 as the next digit of the answer. 
Result so far: 210724.05167958
Deduct 3096 from 3350 and we're left 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.

After the division, we end up with 210724.05167958 and a remainder of 2.54e-07.