We're dividing 21357808 by 14 
The aim is to understand the frequency of 14 in 21357808.

Let's proceed to step 1:
2 divided by 14 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 14

Let's proceed to step 2:
The number 14 fits into 21 1 times, leaving a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 7 after subtracting 14 from 21.
Grab the next digit (3) from the dividend, add it to 7, then carry on: 73 / 14

Moving on to step 3:
When dividing 73 by 14, we get 5 with a remainder of 3.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 3 after subtracting 70 from 73.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 14

Moving on to step 4:
14 can be fit into 35 2 times, resulting in a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 152.0
If we take 28 away from 35, we end up with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 14

Going ahead to step 5:
When dividing 77 by 14, we get 5 with a remainder of 7.
The next digit of our result is 5. 
Result so far: 1525.0
If we take 70 away from 77, we end up with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 14

Going ahead to step 6:
14 goes into 78 5 times with a remainder of 8.
Use 5 as the next digit of our solution. 
Result so far: 15255.0
If we subtract 70 from 78, we get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 14

Moving on to step 7:
When dividing 80 by 14, we get 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 152555.0
If we take 70 away from 80, we end up with 10.
Include the next digit (8) from the dividend after 10, then repeat: 108 / 14

Moving on to step 8:
14 goes into 108 7 times with a remainder of 10.
The next digit of our result is 7. 
Result so far: 1525557.0
If we take 98 away from 108, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
14 goes into 100 7 times with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 1525557.7
Subtracting 98 from 100 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
The number 14 fits into 20 1 times, leaving a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 1525557.71
If we subtract 14 from 20, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
14 can be fit into 60 4 times, resulting in a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 1525557.714
If we subtract 56 from 60, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 12:
14 goes into 40 2 times with a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 1525557.7142
Subtracting 28 from 40 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 13:
14 can be fit into 120 8 times, resulting in a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 1525557.71428
Subtracting 112 from 120 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 14:
80 divided by 14 is 5 with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 1525557.714285
If we take 70 away from 80, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 15:
If we divide 100 by 14, we get 7 and a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 1525557.7142857
If we take 98 away from 100, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 16:
The number 14 fits into 20 1 times, leaving a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1525557.71428571
Subtracting 14 from 20 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

After the division, we end up with 1525557.71428571 and a remainder of 6e-09.