We look at the division of 13138628 by 210 
The aim is to understand the frequency of 210 in 13138628.

Moving on to step 1:
When dividing 1 by 210, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 210

Going ahead to step 2:
If we divide 13 by 210, we get 0 and a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Include the next digit (1) from the dividend after 13, then repeat: 131 / 210

Moving on to step 3:
131 divided by 210 is 0 with a remainder of 131.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 131, we end up with 131.
Take the next digit (3) from the dividend and append it to 131, then repeat: 1313 / 210

Step 4:
If we divide 1313 by 210, we get 6 and a remainder of 53.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 1260 from 1313 and we're left with 53.
Append the next digit (8) from the dividend to 53 and continue with: 538 / 210

Step 5:
210 goes into 538 2 times with a remainder of 118.
Write down 2 as next digit of the result. 
Result so far: 62.0
The remainder is 118 after subtracting 420 from 538.
Append the next digit (6) from the dividend to 118 and continue with: 1186 / 210

Let's proceed to step 6:
The number 210 fits into 1186 5 times, leaving a remainder of 136.
Put 5 as the next digit of the answer. 
Result so far: 625.0
The remainder is 136 after subtracting 1050 from 1186.
Take the next digit (2) from the dividend and append it to 136, then repeat: 1362 / 210

On to step 7:
If we divide 1362 by 210, we get 6 and a remainder of 102.
Put 6 as the next digit of the answer. 
Result so far: 6256.0
Subtracting 1260 from 1362 leaves us with 102.
Fetch the next digit (8) from the dividend, attach it to 102 and continue: 1028 / 210

Let's proceed to step 8:
210 can be fit into 1028 4 times, resulting in a remainder of 188.
Write down 4 as next digit of the result. 
Result so far: 62564.0
Deduct 840 from 1028 and we're left with 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 9:
210 can be fit into 1880 8 times, resulting in a remainder of 200.
Record the quotient 8 as the next digit in the result. 
Result so far: 62564.8
Deduct 1680 from 1880 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 10:
The number 210 fits into 2000 9 times, leaving a remainder of 110.
Write down 9 as next digit of the result. 
Result so far: 62564.89
If we take 1890 away from 2000, we end up with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 11:
210 goes into 1100 5 times with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 62564.895
If we subtract 1050 from 1100, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 12:
210 goes into 500 2 times with a remainder of 80.
Record the quotient 2 as the next digit in the result. 
Result so far: 62564.8952
Subtract 420 from 500 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 13:
800 divided by 210 is 3 with a remainder of 170.
Put 3 as the next digit of the answer. 
Result so far: 62564.89523
Subtract 630 from 800 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Going ahead to step 14:
When dividing 1700 by 210, we get 8 with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 62564.895238
Deduct 1680 from 1700 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 15:
200 divided by 210 is 0 with a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 62564.895238
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 16:
2000 divided by 210 is 9 with a remainder of 110.
The next digit of our result is 9. 
Result so far: 62564.89523809
Deduct 1890 from 2000 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Our division results in 62564.89523809 with a remaining 1.1e-07.