We're dividing 83959771 by 680 
The aim is to understand the frequency of 680 in 83959771.

On to step 1:
When dividing 8 by 680, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 680

On to step 2:
83 divided by 680 is 0 with a remainder of 83.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 83 leaves us with 83.
Fetch the next digit (9) from the dividend, attach it to 83 and continue: 839 / 680

On to step 3:
680 can be fit into 839 1 times, resulting in a remainder of 159.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 680 from 839 leaves us with 159.
Take the next digit (5) from the dividend and append it to 159, then repeat: 1595 / 680

Going ahead to step 4:
680 goes into 1595 2 times with a remainder of 235.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we subtract 1360 from 1595, we get 235.
Take the next digit (9) from the dividend and append it to 235, then repeat: 2359 / 680

Advancing to step 5:
2359 divided by 680 is 3 with a remainder of 319.
The number 3 becomes the next digit in our result. 
Result so far: 123.0
If we subtract 2040 from 2359, we get 319.
Fetch the next digit (7) from the dividend, attach it to 319 and continue: 3197 / 680

Let's proceed to step 6:
680 goes into 3197 4 times with a remainder of 477.
Record the quotient 4 as the next digit in the result. 
Result so far: 1234.0
Subtracting 2720 from 3197 leaves us with 477.
Bring next digit (7) of the dividend behind the 477 and repeat the process: 4777 / 680

On to step 7:
680 can be fit into 4777 7 times, resulting in a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 12347.0
Subtract 4760 from 4777 to get 17.
Bring next digit (1) of the dividend behind the 17 and repeat the process: 171 / 680

On to step 8:
171 divided by 680 is 0 with a remainder of 171.
The next digit of our result is 0. 
Result so far: 123470.0
Deduct 0 from 171 and we're left with 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Moving on to step 9:
When dividing 1710 by 680, we get 2 with a remainder of 350.
Record the quotient 2 as the next digit in the result. 
Result so far: 123470.2
If we take 1360 away from 1710, we end up with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 10:
680 goes into 3500 5 times with a remainder of 100.
The number 5 becomes the next digit in our result. 
Result so far: 123470.25
Subtract 3400 from 3500 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 11:
680 can be fit into 1000 1 times, resulting in a remainder of 320.
The next digit of our result is 1. 
Result so far: 123470.251
The remainder is 320 after subtracting 680 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 12:
680 can be fit into 3200 4 times, resulting in a remainder of 480.
The number 4 becomes the next digit in our result. 
Result so far: 123470.2514
The remainder is 480 after subtracting 2720 from 3200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Going ahead to step 13:
If we divide 4800 by 680, we get 7 and a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 123470.25147
Subtract 4760 from 4800 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 14:
If we divide 400 by 680, we get 0 and a remainder of 400.
The number 0 becomes the next digit in our result. 
Result so far: 123470.25147
Subtracting 0 from 400 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 15:
4000 divided by 680 is 5 with a remainder of 600.
Record the quotient 5 as the next digit in the result. 
Result so far: 123470.2514705
If we take 3400 away from 4000, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Moving on to step 16:
680 goes into 6000 8 times with a remainder of 560.
Use 8 as the next digit of our solution. 
Result so far: 123470.25147058
Deduct 5440 from 6000 and we're left with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

The final outcome is 123470.25147058, with a leftover of 5.6e-07.