86437937 ÷ 691 
The aim is to understand the frequency of 691 in 86437937.

Moving on to step 1:
8 divided by 691 is 0 with 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.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 691

On to step 2:
691 goes into 86 0 times with a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Include the next digit (4) from the dividend after 86, then repeat: 864 / 691

Going ahead to step 3:
864 divided by 691 is 1 with a remainder of 173.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 691 from 864 to get 173.
Grab the next digit (3) from the dividend, add it to 173, then carry on: 1733 / 691

Let's proceed to step 4:
691 goes into 1733 2 times with a remainder of 351.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Deduct 1382 from 1733 and we're left with 351.
Bring next digit (7) of the dividend behind the 351 and repeat the process: 3517 / 691

Step 5:
When dividing 3517 by 691, we get 5 with a remainder of 62.
Write down 5 as next digit of the result. 
Result so far: 125.0
Subtract 3455 from 3517 to get 62.
Append the next digit (9) from the dividend to 62 and continue with: 629 / 691

On to step 6:
If we divide 629 by 691, we get 0 and a remainder of 629.
Use 0 as the next digit of our solution. 
Result so far: 1250.0
If we take 0 away from 629, we end up with 629.
Fetch the next digit (3) from the dividend, attach it to 629 and continue: 6293 / 691

On to step 7:
The number 691 fits into 6293 9 times, leaving a remainder of 74.
The number 9 becomes the next digit in our result. 
Result so far: 12509.0
The remainder is 74 after subtracting 6219 from 6293.
Fetch the next digit (7) from the dividend, attach it to 74 and continue: 747 / 691

Moving on to step 8:
691 goes into 747 1 times with a remainder of 56.
Put 1 as the next digit of the answer. 
Result so far: 125091.0
If we subtract 691 from 747, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 9:
691 goes into 560 0 times with a remainder of 560.
Write down 0 as next digit of the result. 
Result so far: 125091.0
The remainder is 560 after subtracting 0 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Going ahead to step 10:
The number 691 fits into 5600 8 times, leaving a remainder of 72.
The number 8 becomes the next digit in our result. 
Result so far: 125091.08
If we take 5528 away from 5600, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 11:
The number 691 fits into 720 1 times, leaving a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 125091.081
If we take 691 away from 720, we end up 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.

Going ahead to step 12:
The number 691 fits into 290 0 times, leaving a remainder of 290.
Use 0 as the next digit of our solution. 
Result so far: 125091.081
The remainder is 290 after subtracting 0 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 13:
If we divide 2900 by 691, we get 4 and a remainder of 136.
Put 4 as the next digit of the answer. 
Result so far: 125091.08104
If we subtract 2764 from 2900, we get 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Going ahead to step 14:
691 goes into 1360 1 times with a remainder of 669.
The number 1 becomes the next digit in our result. 
Result so far: 125091.081041
Subtract 691 from 1360 to get 669.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6690, and continue the process.

Moving on to step 15:
691 can be fit into 6690 9 times, resulting in a remainder of 471.
Put 9 as the next digit of the answer. 
Result so far: 125091.0810419
Deduct 6219 from 6690 and we're left with 471.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4710, and continue the process.

On to step 16:
The number 691 fits into 4710 6 times, leaving a remainder of 564.
Record the quotient 6 as the next digit in the result. 
Result so far: 125091.08104196
Subtract 4146 from 4710 to get 564.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5640, and continue the process.

Our division results in 125091.08104196 with a remaining 5.64e-07.