We divide 597203 by 81
The aim is to understand the frequency of 81 in 597203.

Let's proceed to step 1:
If we divide 5 by 81, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 81

Moving on to step 2:
If we divide 59 by 81, we get 0 and a remainder of 59.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 59, we get 59.
Grab the next digit (7) from the dividend, add it to 59, then carry on: 597 / 81

On to step 3:
If we divide 597 by 81, we get 7 and a remainder of 30.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we take 567 away from 597, we end up with 30.
Grab the next digit (2) from the dividend, add it to 30, then carry on: 302 / 81

Let's proceed to step 4:
81 can be fit into 302 3 times, resulting in a remainder of 59.
Record the quotient 3 as the next digit in the result. 
Result so far: 73.0
If we take 243 away from 302, we end up with 59.
Fetch the next digit (0) from the dividend, attach it to 59 and continue: 590 / 81

On to step 5:
590 divided by 81 is 7 with a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 737.0
The remainder is 23 after subtracting 567 from 590.
Fetch the next digit (3) from the dividend, attach it to 23 and continue: 233 / 81

Going ahead to step 6:
233 divided by 81 is 2 with a remainder of 71.
Put 2 as the next digit of the answer. 
Result so far: 7372.0
Subtract 162 from 233 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 7:
81 can be fit into 710 8 times, resulting in a remainder of 62.
The next digit of our result is 8. 
Result so far: 7372.8
If we subtract 648 from 710, we get 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 8:
If we divide 620 by 81, we get 7 and a remainder of 53.
The next digit of our result is 7. 
Result so far: 7372.87
Subtract 567 from 620 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 9:
The number 81 fits into 530 6 times, leaving a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 7372.876
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.

Advancing to step 10:
The number 81 fits into 440 5 times, leaving a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 7372.8765
The remainder is 35 after subtracting 405 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 11:
If we divide 350 by 81, we get 4 and a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 7372.87654
Subtract 324 from 350 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 12:
81 can be fit into 260 3 times, resulting in a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 7372.876543
Deduct 243 from 260 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 13:
81 can be fit into 170 2 times, resulting in a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 7372.8765432
If we subtract 162 from 170, we get 8.
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 14:
81 goes into 80 0 times with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 7372.8765432
Subtract 0 from 80 to 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.

Our division results in 7372.8765432 with a remaining 8e-08.