638538 ÷ 13 
The aim is to understand the frequency of 13 in 638538.

Moving on to step 1:
The number 13 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 13

Moving on to step 2:
When dividing 63 by 13, we get 4 with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 52 away from 63, we end up with 11.
Include the next digit (8) from the dividend after 11, then repeat: 118 / 13

Going ahead to step 3:
118 divided by 13 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 49.0
The remainder is 1 after subtracting 117 from 118.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 13

Step 4:
13 goes into 15 1 times with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 491.0
Subtract 13 from 15 to get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 13

Step 5:
23 divided by 13 is 1 with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 4911.0
If we subtract 13 from 23, we get 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 13

Step 6:
13 can be fit into 108 8 times, resulting in a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 49118.0
If we subtract 104 from 108, 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.

Step 7:
13 goes into 40 3 times with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 49118.3
Deduct 39 from 40 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 8:
10 divided by 13 is 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 49118.3
If we take 0 away from 10, 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:
13 goes into 100 7 times with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 49118.307
Subtracting 91 from 100 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 10:
13 can be fit into 90 6 times, resulting in a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 49118.3076
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 11:
13 can be fit into 120 9 times, resulting in a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 49118.30769
The remainder is 3 after subtracting 117 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 12:
When dividing 30 by 13, we get 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 49118.307692
If we take 26 away from 30, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 13:
If we divide 40 by 13, we get 3 and a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 49118.3076923
If we subtract 39 from 40, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 14:
When dividing 10 by 13, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 49118.3076923
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 49118.3076923 with a remainder of 1e-08.