We look at the division of 31001551 by 209 
The aim is to understand the frequency of 209 in 31001551.

Step 1:
The number 209 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 209

Advancing to step 2:
31 divided by 209 is 0 with a remainder of 31.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 31 and we're left with 31.
Grab the next digit (0) from the dividend, add it to 31, then carry on: 310 / 209

Going ahead to step 3:
209 goes into 310 1 times with a remainder of 101.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 209 from 310 and we're left with 101.
Include the next digit (0) from the dividend after 101, then repeat: 1010 / 209

On to step 4:
1010 divided by 209 is 4 with a remainder of 174.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Subtracting 836 from 1010 leaves us with 174.
Append the next digit (1) from the dividend to 174 and continue with: 1741 / 209

On to step 5:
209 can be fit into 1741 8 times, resulting in a remainder of 69.
The next digit of our result is 8. 
Result so far: 148.0
If we subtract 1672 from 1741, we get 69.
Take the next digit (5) from the dividend and append it to 69, then repeat: 695 / 209

Moving on to step 6:
209 goes into 695 3 times with a remainder of 68.
Write down 3 as next digit of the result. 
Result so far: 1483.0
Subtract 627 from 695 to get 68.
Include the next digit (5) from the dividend after 68, then repeat: 685 / 209

Let's proceed to step 7:
If we divide 685 by 209, we get 3 and a remainder of 58.
Use 3 as the next digit of our solution. 
Result so far: 14833.0
Subtracting 627 from 685 leaves us with 58.
Grab the next digit (1) from the dividend, add it to 58, then carry on: 581 / 209

Step 8:
If we divide 581 by 209, we get 2 and a remainder of 163.
The number 2 becomes the next digit in our result. 
Result so far: 148332.0
Subtracting 418 from 581 leaves us with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Advancing to step 9:
209 goes into 1630 7 times with a remainder of 167.
Use 7 as the next digit of our solution. 
Result so far: 148332.7
If we subtract 1463 from 1630, we get 167.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1670, and continue the process.

On to step 10:
209 goes into 1670 7 times with a remainder of 207.
Write down 7 as next digit of the result. 
Result so far: 148332.77
Deduct 1463 from 1670 and we're left with 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

The final result is 148332.77 with a remainder of 0.207.