19664354 divided by 309 
The aim is to understand the frequency of 309 in 19664354.

Step 1:
If we divide 1 by 309, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 309

Going ahead to step 2:
309 goes into 19 0 times with a remainder of 19.
The next digit of our result is 0. 
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 / 309

Going ahead to step 3:
196 divided by 309 is 0 with a remainder of 196.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 196 leaves us with 196.
Take the next digit (6) from the dividend and append it to 196, then repeat: 1966 / 309

On to step 4:
309 goes into 1966 6 times with a remainder of 112.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 112 after subtracting 1854 from 1966.
Include the next digit (4) from the dividend after 112, then repeat: 1124 / 309

Moving on to step 5:
309 goes into 1124 3 times with a remainder of 197.
Put 3 as the next digit of the answer. 
Result so far: 63.0
If we take 927 away from 1124, we end up with 197.
Include the next digit (3) from the dividend after 197, then repeat: 1973 / 309

Moving on to step 6:
1973 divided by 309 is 6 with a remainder of 119.
Record the quotient 6 as the next digit in the result. 
Result so far: 636.0
Subtract 1854 from 1973 to get 119.
Fetch the next digit (5) from the dividend, attach it to 119 and continue: 1195 / 309

Moving on to step 7:
The number 309 fits into 1195 3 times, leaving a remainder of 268.
Write down 3 as next digit of the result. 
Result so far: 6363.0
Subtract 927 from 1195 to get 268.
Fetch the next digit (4) from the dividend, attach it to 268 and continue: 2684 / 309

Going ahead to step 8:
The number 309 fits into 2684 8 times, leaving a remainder of 212.
Put 8 as the next digit of the answer. 
Result so far: 63638.0
The remainder is 212 after subtracting 2472 from 2684.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Let's proceed to step 9:
2120 divided by 309 is 6 with a remainder of 266.
The next digit of our result is 6. 
Result so far: 63638.6
Deduct 1854 from 2120 and we're left with 266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2660, and continue the process.

Going ahead to step 10:
309 can be fit into 2660 8 times, resulting in a remainder of 188.
The number 8 becomes the next digit in our result. 
Result so far: 63638.68
If we subtract 2472 from 2660, we get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Moving on to step 11:
309 goes into 1880 6 times with a remainder of 26.
Use 6 as the next digit of our solution. 
Result so far: 63638.686
Subtract 1854 from 1880 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 12:
If we divide 260 by 309, we get 0 and a remainder of 260.
Put 0 as the next digit of the answer. 
Result so far: 63638.686
Subtract 0 from 260 to get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 13:
2600 divided by 309 is 8 with a remainder of 128.
The next digit of our result is 8. 
Result so far: 63638.68608
Subtract 2472 from 2600 to get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 14:
If we divide 1280 by 309, we get 4 and a remainder of 44.
The number 4 becomes the next digit in our result. 
Result so far: 63638.686084
The remainder is 44 after subtracting 1236 from 1280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 15:
309 goes into 440 1 times with a remainder of 131.
The next digit of our result is 1. 
Result so far: 63638.6860841
Subtracting 309 from 440 leaves us with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Moving on to step 16:
309 goes into 1310 4 times with a remainder of 74.
Use 4 as the next digit of our solution. 
Result so far: 63638.68608414
Subtracting 1236 from 1310 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

After the division, we end up with 63638.68608414 and a remainder of 7.4e-08.