81871557 ÷ 38 
The aim is to understand the frequency of 38 in 81871557.

On to step 1:
The number 38 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 38

Let's proceed to step 2:
38 can be fit into 81 2 times, resulting in a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 76 from 81 and we're left with 5.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 38

Advancing to step 3:
38 goes into 58 1 times with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Subtracting 38 from 58 leaves us with 20.
Include the next digit (7) from the dividend after 20, then repeat: 207 / 38

On to step 4:
The number 38 fits into 207 5 times, leaving a remainder of 17.
Put 5 as the next digit of the answer. 
Result so far: 215.0
If we subtract 190 from 207, we get 17.
Take the next digit (1) from the dividend and append it to 17, then repeat: 171 / 38

Moving on to step 5:
The number 38 fits into 171 4 times, leaving a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 2154.0
Deduct 152 from 171 and we're left with 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 38

Going ahead to step 6:
If we divide 195 by 38, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 21545.0
If we take 190 away from 195, we end up with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 38

Going ahead to step 7:
38 goes into 55 1 times with a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 215451.0
Deduct 38 from 55 and we're left with 17.
Take the next digit (7) from the dividend and append it to 17, then repeat: 177 / 38

Advancing to step 8:
177 divided by 38 is 4 with a remainder of 25.
Write down 4 as next digit of the result. 
Result so far: 2154514.0
If we take 152 away from 177, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 9:
38 goes into 250 6 times with a remainder of 22.
Write down 6 as next digit of the result. 
Result so far: 2154514.6
If we take 228 away from 250, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 10:
38 goes into 220 5 times with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 2154514.65
If we subtract 190 from 220, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 11:
38 can be fit into 300 7 times, resulting in a remainder of 34.
Use 7 as the next digit of our solution. 
Result so far: 2154514.657
Deduct 266 from 300 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 12:
38 can be fit into 340 8 times, resulting in a remainder of 36.
The next digit of our result is 8. 
Result so far: 2154514.6578
Subtract 304 from 340 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 13:
If we divide 360 by 38, we get 9 and a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 2154514.65789
Deduct 342 from 360 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 14:
180 divided by 38 is 4 with a remainder of 28.
The next digit of our result is 4. 
Result so far: 2154514.657894
The remainder is 28 after subtracting 152 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 15:
280 divided by 38 is 7 with a remainder of 14.
The next digit of our result is 7. 
Result so far: 2154514.6578947
Subtract 266 from 280 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 16:
The number 38 fits into 140 3 times, leaving a remainder of 26.
Use 3 as the next digit of our solution. 
Result so far: 2154514.65789473
Subtract 114 from 140 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.

The final result is 2154514.65789473 with a remainder of 2.6e-08.