Let's divide 13395354 by 639
The aim is to understand the frequency of 639 in 13395354.

Let's proceed to step 1:
When dividing 1 by 639, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 639

Advancing to step 2:
If we divide 13 by 639, we get 0 and a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Include the next digit (3) from the dividend after 13, then repeat: 133 / 639

Step 3:
The number 639 fits into 133 0 times, leaving a remainder of 133.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 133, we end up with 133.
Fetch the next digit (9) from the dividend, attach it to 133 and continue: 1339 / 639

Moving on to step 4:
639 goes into 1339 2 times with a remainder of 61.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 1278 away from 1339, we end up with 61.
Append the next digit (5) from the dividend to 61 and continue with: 615 / 639

Going ahead to step 5:
639 goes into 615 0 times with a remainder of 615.
Put 0 as the next digit of the answer. 
Result so far: 20.0
If we subtract 0 from 615, we get 615.
Include the next digit (3) from the dividend after 615, then repeat: 6153 / 639

Let's proceed to step 6:
639 can be fit into 6153 9 times, resulting in a remainder of 402.
Record the quotient 9 as the next digit in the result. 
Result so far: 209.0
Subtracting 5751 from 6153 leaves us with 402.
Include the next digit (5) from the dividend after 402, then repeat: 4025 / 639

Step 7:
The number 639 fits into 4025 6 times, leaving a remainder of 191.
Record the quotient 6 as the next digit in the result. 
Result so far: 2096.0
If we take 3834 away from 4025, we end up with 191.
Take the next digit (4) from the dividend and append it to 191, then repeat: 1914 / 639

On to step 8:
639 can be fit into 1914 2 times, resulting in a remainder of 636.
The next digit of our result is 2. 
Result so far: 20962.0
If we take 1278 away from 1914, we end up with 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Going ahead to step 9:
If we divide 6360 by 639, we get 9 and a remainder of 609.
Write down 9 as next digit of the result. 
Result so far: 20962.9
If we subtract 5751 from 6360, we get 609.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6090, and continue the process.

On to step 10:
The number 639 fits into 6090 9 times, leaving a remainder of 339.
Use 9 as the next digit of our solution. 
Result so far: 20962.99
Subtracting 5751 from 6090 leaves us with 339.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3390, and continue the process.

The quotient of the division is 20962.99, and the remainder is 0.339.