Let's divide 19686086 by 909
The aim is to understand the frequency of 909 in 19686086.

On to step 1:
When dividing 1 by 909, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 909

Advancing to step 2:
If we divide 19 by 909, we get 0 and a remainder of 19.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 19 and we're left with 19.
Include the next digit (6) from the dividend after 19, then repeat: 196 / 909

Advancing to step 3:
If we divide 196 by 909, we get 0 and a remainder of 196.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 196, we end up with 196.
Take the next digit (8) from the dividend and append it to 196, then repeat: 1968 / 909

Step 4:
The number 909 fits into 1968 2 times, leaving a remainder of 150.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 1818 from 1968 leaves us with 150.
Fetch the next digit (6) from the dividend, attach it to 150 and continue: 1506 / 909

Moving on to step 5:
If we divide 1506 by 909, we get 1 and a remainder of 597.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we subtract 909 from 1506, we get 597.
Take the next digit (0) from the dividend and append it to 597, then repeat: 5970 / 909

Moving on to step 6:
909 can be fit into 5970 6 times, resulting in a remainder of 516.
Use 6 as the next digit of our solution. 
Result so far: 216.0
Subtract 5454 from 5970 to get 516.
Grab the next digit (8) from the dividend, add it to 516, then carry on: 5168 / 909

Advancing to step 7:
If we divide 5168 by 909, we get 5 and a remainder of 623.
Write down 5 as next digit of the result. 
Result so far: 2165.0
Subtracting 4545 from 5168 leaves us with 623.
Bring next digit (6) of the dividend behind the 623 and repeat the process: 6236 / 909

On to step 8:
When dividing 6236 by 909, we get 6 with a remainder of 782.
Write down 6 as next digit of the result. 
Result so far: 21656.0
The remainder is 782 after subtracting 5454 from 6236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7820, and continue the process.

Moving on to step 9:
When dividing 7820 by 909, we get 8 with a remainder of 548.
Write down 8 as next digit of the result. 
Result so far: 21656.8
Subtract 7272 from 7820 to get 548.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

Going ahead to step 10:
5480 divided by 909 is 6 with a remainder of 26.
Put 6 as the next digit of the answer. 
Result so far: 21656.86
If we take 5454 away from 5480, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 11:
If we divide 260 by 909, we get 0 and a remainder of 260.
Put 0 as the next digit of the answer. 
Result so far: 21656.86
Subtracting 0 from 260 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 12:
909 can be fit into 2600 2 times, resulting in a remainder of 782.
Write down 2 as next digit of the result. 
Result so far: 21656.8602
Deduct 1818 from 2600 and we're left with 782.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7820, and continue the process.

Going ahead to step 13:
If we divide 7820 by 909, we get 8 and a remainder of 548.
The number 8 becomes the next digit in our result. 
Result so far: 21656.86028
The remainder is 548 after subtracting 7272 from 7820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

Moving on to step 14:
The number 909 fits into 5480 6 times, leaving a remainder of 26.
The number 6 becomes the next digit in our result. 
Result so far: 21656.860286
The remainder is 26 after subtracting 5454 from 5480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 15:
260 divided by 909 is 0 with a remainder of 260.
The number 0 becomes the next digit in our result. 
Result so far: 21656.860286
Subtracting 0 from 260 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 16:
909 goes into 2600 2 times with a remainder of 782.
Put 2 as the next digit of the answer. 
Result so far: 21656.86028602
Subtract 1818 from 2600 to get 782.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7820, and continue the process.

After the division, we end up with 21656.86028602 and a remainder of 7.82e-07.