Let's divide 899621 by 81
The aim is to understand the frequency of 81 in 899621.

Step 1:
The number 81 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 81

Let's proceed to step 2:
81 can be fit into 89 1 times, resulting in a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 81 away from 89, we end up with 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 81

Advancing to step 3:
81 goes into 89 1 times with a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Subtracting 81 from 89 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 81

Moving on to step 4:
If we divide 86 by 81, we get 1 and a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 111.0
If we take 81 away from 86, we end up with 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 81

Let's proceed to step 5:
52 divided by 81 is 0 with a remainder of 52.
The next digit of our result is 0. 
Result so far: 1110.0
Subtract 0 from 52 to get 52.
Fetch the next digit (1) from the dividend, attach it to 52 and continue: 521 / 81

Let's proceed to step 6:
521 divided by 81 is 6 with a remainder of 35.
The next digit of our result is 6. 
Result so far: 11106.0
The remainder is 35 after subtracting 486 from 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 7:
81 goes into 350 4 times with a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 11106.4
Deduct 324 from 350 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 8:
81 goes into 260 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 11106.43
If we subtract 243 from 260, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 9:
81 can be fit into 170 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 11106.432
The remainder is 8 after subtracting 162 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 10:
The number 81 fits into 80 0 times, leaving a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 11106.432
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 11:
81 goes into 800 9 times with a remainder of 71.
Write down 9 as next digit of the result. 
Result so far: 11106.43209
If we take 729 away from 800, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 12:
81 goes into 710 8 times with a remainder of 62.
Put 8 as the next digit of the answer. 
Result so far: 11106.432098
Subtracting 648 from 710 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 13:
81 can be fit into 620 7 times, resulting in a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 11106.4320987
Deduct 567 from 620 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 14:
When dividing 530 by 81, we get 6 with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 11106.43209876
Subtracting 486 from 530 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

After the division, we end up with 11106.43209876 and a remainder of 4.4e-08.