8156172 ÷ 210 
The aim is to understand the frequency of 210 in 8156172.

Let's proceed to step 1:
If we divide 8 by 210, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 210

Advancing to step 2:
210 goes into 81 0 times with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Include the next digit (5) from the dividend after 81, then repeat: 815 / 210

Advancing to step 3:
If we divide 815 by 210, we get 3 and a remainder of 185.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 185 after subtracting 630 from 815.
Grab the next digit (6) from the dividend, add it to 185, then carry on: 1856 / 210

Going ahead to step 4:
When dividing 1856 by 210, we get 8 with a remainder of 176.
Put 8 as the next digit of the answer. 
Result so far: 38.0
The remainder is 176 after subtracting 1680 from 1856.
Include the next digit (1) from the dividend after 176, then repeat: 1761 / 210

On to step 5:
210 goes into 1761 8 times with a remainder of 81.
The next digit of our result is 8. 
Result so far: 388.0
Subtract 1680 from 1761 to get 81.
Take the next digit (7) from the dividend and append it to 81, then repeat: 817 / 210

Moving on to step 6:
210 can be fit into 817 3 times, resulting in a remainder of 187.
Record the quotient 3 as the next digit in the result. 
Result so far: 3883.0
Subtract 630 from 817 to get 187.
Include the next digit (2) from the dividend after 187, then repeat: 1872 / 210

Going ahead to step 7:
1872 divided by 210 is 8 with a remainder of 192.
Write down 8 as next digit of the result. 
Result so far: 38838.0
If we subtract 1680 from 1872, we get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Step 8:
210 can be fit into 1920 9 times, resulting in a remainder of 30.
The next digit of our result is 9. 
Result so far: 38838.9
Subtracting 1890 from 1920 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
300 divided by 210 is 1 with a remainder of 90.
The number 1 becomes the next digit in our result. 
Result so far: 38838.91
If we take 210 away from 300, we end up with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 10:
900 divided by 210 is 4 with a remainder of 60.
The next digit of our result is 4. 
Result so far: 38838.914
Subtracting 840 from 900 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 11:
210 can be fit into 600 2 times, resulting in a remainder of 180.
Write down 2 as next digit of the result. 
Result so far: 38838.9142
Subtracting 420 from 600 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Moving on to step 12:
When dividing 1800 by 210, we get 8 with a remainder of 120.
The next digit of our result is 8. 
Result so far: 38838.91428
Subtracting 1680 from 1800 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 13:
The number 210 fits into 1200 5 times, leaving a remainder of 150.
Use 5 as the next digit of our solution. 
Result so far: 38838.914285
Subtract 1050 from 1200 to get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 14:
210 goes into 1500 7 times with a remainder of 30.
Use 7 as the next digit of our solution. 
Result so far: 38838.9142857
If we take 1470 away from 1500, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 15:
210 can be fit into 300 1 times, resulting in a remainder of 90.
Use 1 as the next digit of our solution. 
Result so far: 38838.91428571
Subtracting 210 from 300 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

The final outcome is 38838.91428571, with a leftover of 9e-08.