370942 ÷ 81 
The aim is to understand the frequency of 81 in 370942.

Step 1:
81 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 81

On to step 2:
81 can be fit into 37 0 times, resulting in a remainder of 37.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 37, we end up with 37.
Grab the next digit (0) from the dividend, add it to 37, then carry on: 370 / 81

Moving on to step 3:
81 can be fit into 370 4 times, resulting in a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 324 from 370 leaves us with 46.
Grab the next digit (9) from the dividend, add it to 46, then carry on: 469 / 81

Moving on to step 4:
When dividing 469 by 81, we get 5 with a remainder of 64.
Use 5 as the next digit of our solution. 
Result so far: 45.0
Deduct 405 from 469 and we're left with 64.
Append the next digit (4) from the dividend to 64 and continue with: 644 / 81

Going ahead to step 5:
The number 81 fits into 644 7 times, leaving a remainder of 77.
Use 7 as the next digit of our solution. 
Result so far: 457.0
If we subtract 567 from 644, we get 77.
Append the next digit (2) from the dividend to 77 and continue with: 772 / 81

Let's proceed to step 6:
772 divided by 81 is 9 with a remainder of 43.
Use 9 as the next digit of our solution. 
Result so far: 4579.0
Deduct 729 from 772 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 7:
The number 81 fits into 430 5 times, leaving a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 4579.5
If we subtract 405 from 430, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 8:
When dividing 250 by 81, we get 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 4579.53
Deduct 243 from 250 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 9:
70 divided by 81 is 0 with a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 4579.53
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 10:
700 divided by 81 is 8 with a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 4579.5308
Deduct 648 from 700 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 11:
The number 81 fits into 520 6 times, leaving a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 4579.53086
Subtracting 486 from 520 leaves us 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:
81 goes into 340 4 times with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 4579.530864
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 13:
160 divided by 81 is 1 with a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 4579.5308641
The remainder is 79 after subtracting 81 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Step 14:
81 can be fit into 790 9 times, resulting in a remainder of 61.
The number 9 becomes the next digit in our result. 
Result so far: 4579.53086419
Subtract 729 from 790 to get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Our division results in 4579.53086419 with a remaining 6.1e-08.