We look at the division of 2128 by 31 
The aim is to understand the frequency of 31 in 2128.

Advancing to step 1:
2 divided by 31 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 31

Going ahead to step 2:
The number 31 fits into 21 0 times, leaving a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (2) from the dividend, add it to 21, then carry on: 212 / 31

Advancing to step 3:
The number 31 fits into 212 6 times, leaving a remainder of 26.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 186 from 212 and we're left with 26.
Append the next digit (8) from the dividend to 26 and continue with: 268 / 31

Step 4:
268 divided by 31 is 8 with a remainder of 20.
Record the quotient 8 as the next digit in the result. 
Result so far: 68.0
Subtract 248 from 268 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 5:
If we divide 200 by 31, we get 6 and a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 68.6
If we subtract 186 from 200, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 6:
If we divide 140 by 31, we get 4 and a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 68.64
Subtract 124 from 140 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
31 goes into 160 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 68.645
If we take 155 away from 160, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 8:
If we divide 50 by 31, we get 1 and a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 68.6451
Subtracting 31 from 50 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 9:
31 goes into 190 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 68.64516
If we take 186 away from 190, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
40 divided by 31 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 68.645161
If we subtract 31 from 40, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
The number 31 fits into 90 2 times, leaving a remainder of 28.
The next digit of our result is 2. 
Result so far: 68.6451612
Subtracting 62 from 90 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 12:
The number 31 fits into 280 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 68.64516129
If we take 279 away from 280, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 68.64516129 with a remainder of 1e-09.