We look at the division of 901244 by 81 
The aim is to understand the frequency of 81 in 901244.

Step 1:
9 divided by 81 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 81

On to step 2:
If we divide 90 by 81, we get 1 and a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 9 after subtracting 81 from 90.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 81

On to step 3:
When dividing 91 by 81, we get 1 with a remainder of 10.
The next digit of our result is 1. 
Result so far: 11.0
If we take 81 away from 91, we end up with 10.
Append the next digit (2) from the dividend to 10 and continue with: 102 / 81

Step 4:
When dividing 102 by 81, we get 1 with a remainder of 21.
Put 1 as the next digit of the answer. 
Result so far: 111.0
If we take 81 away from 102, we end up with 21.
Append the next digit (4) from the dividend to 21 and continue with: 214 / 81

Advancing to step 5:
If we divide 214 by 81, we get 2 and a remainder of 52.
Put 2 as the next digit of the answer. 
Result so far: 1112.0
Subtract 162 from 214 to get 52.
Append the next digit (4) from the dividend to 52 and continue with: 524 / 81

Advancing to step 6:
524 divided by 81 is 6 with a remainder of 38.
Put 6 as the next digit of the answer. 
Result so far: 11126.0
If we subtract 486 from 524, 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.

Step 7:
380 divided by 81 is 4 with a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 11126.4
Subtracting 324 from 380 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 8:
If we divide 560 by 81, we get 6 and a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 11126.46
Deduct 486 from 560 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 9:
The number 81 fits into 740 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 11126.469
Deduct 729 from 740 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 10:
If we divide 110 by 81, we get 1 and a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 11126.4691
Subtracting 81 from 110 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 11:
81 goes into 290 3 times with a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 11126.46913
Subtracting 243 from 290 leaves us 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.

Let's proceed to step 12:
If we divide 470 by 81, we get 5 and a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 11126.469135
Deduct 405 from 470 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 13:
81 can be fit into 650 8 times, resulting in a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 11126.4691358
Deduct 648 from 650 and we're left with 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 14:
20 divided by 81 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 11126.4691358
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

In conclusion, the division gives 11126.4691358 with a balance of 2e-08.