688751 divided by 31 
The aim is to understand the frequency of 31 in 688751.

Moving on to step 1:
6 divided by 31 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 31

Going ahead to step 2:
31 goes into 68 2 times with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 62 from 68 leaves us with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 31

Let's proceed to step 3:
31 can be fit into 68 2 times, resulting in a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 22.0
Deduct 62 from 68 and we're left with 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 31

Going ahead to step 4:
67 divided by 31 is 2 with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 222.0
Subtracting 62 from 67 leaves us with 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 31

Advancing to step 5:
31 can be fit into 55 1 times, resulting in a remainder of 24.
The next digit of our result is 1. 
Result so far: 2221.0
Subtract 31 from 55 to get 24.
Fetch the next digit (1) from the dividend, attach it to 24 and continue: 241 / 31

Advancing to step 6:
The number 31 fits into 241 7 times, leaving a remainder of 24.
The number 7 becomes the next digit in our result. 
Result so far: 22217.0
If we take 217 away from 241, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 7:
If we divide 240 by 31, we get 7 and a remainder of 23.
The next digit of our result is 7. 
Result so far: 22217.7
If we subtract 217 from 240, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 8:
31 can be fit into 230 7 times, resulting in a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 22217.77
Deduct 217 from 230 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Our division results in 22217.77 with a remaining 0.013.