We look at the division of 90745983 by 691 
The aim is to understand the frequency of 691 in 90745983.

Going ahead to step 1:
9 divided by 691 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 691

Step 2:
If we divide 90 by 691, we get 0 and a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Take the next digit (7) from the dividend and append it to 90, then repeat: 907 / 691

Advancing to step 3:
691 goes into 907 1 times with a remainder of 216.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 691 from 907 leaves us with 216.
Fetch the next digit (4) from the dividend, attach it to 216 and continue: 2164 / 691

Going ahead to step 4:
When dividing 2164 by 691, we get 3 with a remainder of 91.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
The remainder is 91 after subtracting 2073 from 2164.
Include the next digit (5) from the dividend after 91, then repeat: 915 / 691

On to step 5:
If we divide 915 by 691, we get 1 and a remainder of 224.
Use 1 as the next digit of our solution. 
Result so far: 131.0
If we take 691 away from 915, we end up with 224.
Append the next digit (9) from the dividend to 224 and continue with: 2249 / 691

Advancing to step 6:
2249 divided by 691 is 3 with a remainder of 176.
Put 3 as the next digit of the answer. 
Result so far: 1313.0
The remainder is 176 after subtracting 2073 from 2249.
Bring next digit (8) of the dividend behind the 176 and repeat the process: 1768 / 691

Step 7:
If we divide 1768 by 691, we get 2 and a remainder of 386.
Put 2 as the next digit of the answer. 
Result so far: 13132.0
Subtract 1382 from 1768 to get 386.
Fetch the next digit (3) from the dividend, attach it to 386 and continue: 3863 / 691

Going ahead to step 8:
The number 691 fits into 3863 5 times, leaving a remainder of 408.
Record the quotient 5 as the next digit in the result. 
Result so far: 131325.0
Deduct 3455 from 3863 and we're left with 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

Moving on to step 9:
691 can be fit into 4080 5 times, resulting in a remainder of 625.
Write down 5 as next digit of the result. 
Result so far: 131325.5
If we take 3455 away from 4080, we end up with 625.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6250, and continue the process.

Advancing to step 10:
If we divide 6250 by 691, we get 9 and a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 131325.59
If we take 6219 away from 6250, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 11:
310 divided by 691 is 0 with a remainder of 310.
Use 0 as the next digit of our solution. 
Result so far: 131325.59
Subtract 0 from 310 to get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Going ahead to step 12:
The number 691 fits into 3100 4 times, leaving a remainder of 336.
The next digit of our result is 4. 
Result so far: 131325.5904
If we take 2764 away from 3100, we end up with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Advancing to step 13:
The number 691 fits into 3360 4 times, leaving a remainder of 596.
The number 4 becomes the next digit in our result. 
Result so far: 131325.59044
Subtract 2764 from 3360 to get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

The quotient of the division is 131325.59044, and the remainder is 0.000596.