8210221 ÷ 348 
The aim is to understand the frequency of 348 in 8210221.

Going ahead to step 1:
348 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (2) from the dividend after 8, then repeat: 82 / 348

Let's proceed to step 2:
348 can be fit into 82 0 times, resulting in a remainder of 82.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 82 to get 82.
Grab the next digit (1) from the dividend, add it to 82, then carry on: 821 / 348

Let's proceed to step 3:
When dividing 821 by 348, we get 2 with a remainder of 125.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 696 from 821 and we're left with 125.
Append the next digit (0) from the dividend to 125 and continue with: 1250 / 348

Moving on to step 4:
348 can be fit into 1250 3 times, resulting in a remainder of 206.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
Deduct 1044 from 1250 and we're left with 206.
Include the next digit (2) from the dividend after 206, then repeat: 2062 / 348

Going ahead to step 5:
2062 divided by 348 is 5 with a remainder of 322.
Use 5 as the next digit of our solution. 
Result so far: 235.0
Deduct 1740 from 2062 and we're left with 322.
Append the next digit (2) from the dividend to 322 and continue with: 3222 / 348

On to step 6:
The number 348 fits into 3222 9 times, leaving a remainder of 90.
Write down 9 as next digit of the result. 
Result so far: 2359.0
Deduct 3132 from 3222 and we're left with 90.
Take the next digit (1) from the dividend and append it to 90, then repeat: 901 / 348

On to step 7:
If we divide 901 by 348, we get 2 and a remainder of 205.
The number 2 becomes the next digit in our result. 
Result so far: 23592.0
If we take 696 away from 901, we end up with 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Moving on to step 8:
When dividing 2050 by 348, we get 5 with a remainder of 310.
The number 5 becomes the next digit in our result. 
Result so far: 23592.5
The remainder is 310 after subtracting 1740 from 2050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Going ahead to step 9:
348 goes into 3100 8 times with a remainder of 316.
Use 8 as the next digit of our solution. 
Result so far: 23592.58
Subtract 2784 from 3100 to get 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Going ahead to step 10:
3160 divided by 348 is 9 with a remainder of 28.
Use 9 as the next digit of our solution. 
Result so far: 23592.589
The remainder is 28 after subtracting 3132 from 3160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 11:
The number 348 fits into 280 0 times, leaving a remainder of 280.
Use 0 as the next digit of our solution. 
Result so far: 23592.589
If we subtract 0 from 280, we get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 12:
348 goes into 2800 8 times with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 23592.58908
Subtracting 2784 from 2800 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 13:
160 divided by 348 is 0 with a remainder of 160.
Use 0 as the next digit of our solution. 
Result so far: 23592.58908
The remainder is 160 after subtracting 0 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 14:
348 goes into 1600 4 times with a remainder of 208.
Record the quotient 4 as the next digit in the result. 
Result so far: 23592.5890804
If we subtract 1392 from 1600, we get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Going ahead to step 15:
2080 divided by 348 is 5 with a remainder of 340.
Record the quotient 5 as the next digit in the result. 
Result so far: 23592.58908045
Deduct 1740 from 2080 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

The final outcome is 23592.58908045, with a leftover of 3.4e-07.