We divide 139376 by 81
The aim is to understand the frequency of 81 in 139376.

Step 1:
The number 81 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 81

Let's proceed to step 2:
When dividing 13 by 81, we get 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Append the next digit (9) from the dividend to 13 and continue with: 139 / 81

Let's proceed to step 3:
If we divide 139 by 81, we get 1 and a remainder of 58.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 81 away from 139, we end up with 58.
Grab the next digit (3) from the dividend, add it to 58, then carry on: 583 / 81

Going ahead to step 4:
If we divide 583 by 81, we get 7 and a remainder of 16.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
Subtracting 567 from 583 leaves us with 16.
Include the next digit (7) from the dividend after 16, then repeat: 167 / 81

Moving on to step 5:
81 goes into 167 2 times with a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 172.0
The remainder is 5 after subtracting 162 from 167.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 81

On to step 6:
56 divided by 81 is 0 with a remainder of 56.
The next digit of our result is 0. 
Result so far: 1720.0
The remainder is 56 after subtracting 0 from 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 7:
81 goes into 560 6 times with a remainder of 74.
Write down 6 as next digit of the result. 
Result so far: 1720.6
The remainder is 74 after subtracting 486 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 8:
81 goes into 740 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 1720.69
The remainder is 11 after subtracting 729 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
81 goes into 110 1 times with a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 1720.691
If we subtract 81 from 110, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 10:
If we divide 290 by 81, we get 3 and a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 1720.6913
Deduct 243 from 290 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 11:
81 can be fit into 470 5 times, resulting in a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 1720.69135
Subtract 405 from 470 to 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 12:
81 goes into 650 8 times with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 1720.691358
Subtract 648 from 650 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 13:
81 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 1720.691358
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 14:
The number 81 fits into 200 2 times, leaving a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 1720.69135802
If we subtract 162 from 200, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

After the division, we end up with 1720.69135802 and a remainder of 3.8e-08.