We look at the division of 83837963 by 581 
The aim is to understand the frequency of 581 in 83837963.

Going ahead to step 1:
The number 581 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 581

On to step 2:
83 divided by 581 is 0 with a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 83 and we're left with 83.
Bring next digit (8) of the dividend behind the 83 and repeat the process: 838 / 581

On to step 3:
The number 581 fits into 838 1 times, leaving a remainder of 257.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 581 from 838 to get 257.
Append the next digit (3) from the dividend to 257 and continue with: 2573 / 581

On to step 4:
The number 581 fits into 2573 4 times, leaving a remainder of 249.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Subtracting 2324 from 2573 leaves us with 249.
Append the next digit (7) from the dividend to 249 and continue with: 2497 / 581

Advancing to step 5:
When dividing 2497 by 581, we get 4 with a remainder of 173.
Put 4 as the next digit of the answer. 
Result so far: 144.0
Subtract 2324 from 2497 to get 173.
Include the next digit (9) from the dividend after 173, then repeat: 1739 / 581

Advancing to step 6:
581 goes into 1739 2 times with a remainder of 577.
Write down 2 as next digit of the result. 
Result so far: 1442.0
The remainder is 577 after subtracting 1162 from 1739.
Include the next digit (6) from the dividend after 577, then repeat: 5776 / 581

Let's proceed to step 7:
If we divide 5776 by 581, we get 9 and a remainder of 547.
Use 9 as the next digit of our solution. 
Result so far: 14429.0
Deduct 5229 from 5776 and we're left with 547.
Take the next digit (3) from the dividend and append it to 547, then repeat: 5473 / 581

Advancing to step 8:
If we divide 5473 by 581, we get 9 and a remainder of 244.
Use 9 as the next digit of our solution. 
Result so far: 144299.0
If we subtract 5229 from 5473, we get 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Advancing to step 9:
When dividing 2440 by 581, we get 4 with a remainder of 116.
Record the quotient 4 as the next digit in the result. 
Result so far: 144299.4
If we subtract 2324 from 2440, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Step 10:
The number 581 fits into 1160 1 times, leaving a remainder of 579.
Use 1 as the next digit of our solution. 
Result so far: 144299.41
Deduct 581 from 1160 and we're left with 579.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5790, and continue the process.

Advancing to step 11:
The number 581 fits into 5790 9 times, leaving a remainder of 561.
Put 9 as the next digit of the answer. 
Result so far: 144299.419
If we take 5229 away from 5790, we end up with 561.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5610, and continue the process.

Step 12:
If we divide 5610 by 581, we get 9 and a remainder of 381.
The number 9 becomes the next digit in our result. 
Result so far: 144299.4199
Subtracting 5229 from 5610 leaves us with 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

The final result is 144299.4199 with a remainder of 0.00381.