We're dividing 978388 by 81 
The aim is to understand the frequency of 81 in 978388.

Going ahead to step 1:
81 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 81

Let's proceed to step 2:
The number 81 fits into 97 1 times, leaving a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 16 after subtracting 81 from 97.
Bring next digit (8) of the dividend behind the 16 and repeat the process: 168 / 81

Let's proceed to step 3:
When dividing 168 by 81, we get 2 with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 12.0
The remainder is 6 after subtracting 162 from 168.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 81

Moving on to step 4:
The number 81 fits into 63 0 times, leaving a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 120.0
If we subtract 0 from 63, we get 63.
Take the next digit (8) from the dividend and append it to 63, then repeat: 638 / 81

Step 5:
81 can be fit into 638 7 times, resulting in a remainder of 71.
Write down 7 as next digit of the result. 
Result so far: 1207.0
If we take 567 away from 638, we end up with 71.
Include the next digit (8) from the dividend after 71, then repeat: 718 / 81

Advancing to step 6:
If we divide 718 by 81, we get 8 and a remainder of 70.
The number 8 becomes the next digit in our result. 
Result so far: 12078.0
Subtracting 648 from 718 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 7:
If we divide 700 by 81, we get 8 and a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 12078.8
If we subtract 648 from 700, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 8:
When dividing 520 by 81, we get 6 with a remainder of 34.
The next digit of our result is 6. 
Result so far: 12078.86
If we take 486 away from 520, we end up 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 9:
If we divide 340 by 81, we get 4 and a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 12078.864
Deduct 324 from 340 and we're left 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.

Let's proceed to step 10:
The number 81 fits into 160 1 times, leaving a remainder of 79.
The next digit of our result is 1. 
Result so far: 12078.8641
Subtracting 81 from 160 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Step 11:
790 divided by 81 is 9 with a remainder of 61.
Put 9 as the next digit of the answer. 
Result so far: 12078.86419
Subtracting 729 from 790 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Step 12:
81 goes into 610 7 times with a remainder of 43.
The next digit of our result is 7. 
Result so far: 12078.864197
Deduct 567 from 610 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.

Going ahead to step 13:
81 goes into 430 5 times with a remainder of 25.
The next digit of our result is 5. 
Result so far: 12078.8641975
If we take 405 away from 430, 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.

Step 14:
The number 81 fits into 250 3 times, leaving a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 12078.86419753
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.

After the division, we end up with 12078.86419753 and a remainder of 7e-09.