We're dividing 6378198 by 213 
The aim is to understand the frequency of 213 in 6378198.

Let's proceed to step 1:
If we divide 6 by 213, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 213

On to step 2:
The number 213 fits into 63 0 times, leaving a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Bring next digit (7) of the dividend behind the 63 and repeat the process: 637 / 213

Step 3:
213 goes into 637 2 times with a remainder of 211.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 426 from 637 to get 211.
Fetch the next digit (8) from the dividend, attach it to 211 and continue: 2118 / 213

On to step 4:
When dividing 2118 by 213, we get 9 with a remainder of 201.
Record the quotient 9 as the next digit in the result. 
Result so far: 29.0
If we take 1917 away from 2118, we end up with 201.
Append the next digit (1) from the dividend to 201 and continue with: 2011 / 213

Let's proceed to step 5:
2011 divided by 213 is 9 with a remainder of 94.
The next digit of our result is 9. 
Result so far: 299.0
The remainder is 94 after subtracting 1917 from 2011.
Include the next digit (9) from the dividend after 94, then repeat: 949 / 213

Step 6:
213 can be fit into 949 4 times, resulting in a remainder of 97.
The number 4 becomes the next digit in our result. 
Result so far: 2994.0
Deduct 852 from 949 and we're left with 97.
Bring next digit (8) of the dividend behind the 97 and repeat the process: 978 / 213

Step 7:
If we divide 978 by 213, we get 4 and a remainder of 126.
Write down 4 as next digit of the result. 
Result so far: 29944.0
The remainder is 126 after subtracting 852 from 978.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Advancing to step 8:
213 can be fit into 1260 5 times, resulting in a remainder of 195.
Record the quotient 5 as the next digit in the result. 
Result so far: 29944.5
The remainder is 195 after subtracting 1065 from 1260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Step 9:
If we divide 1950 by 213, we get 9 and a remainder of 33.
Put 9 as the next digit of the answer. 
Result so far: 29944.59
The remainder is 33 after subtracting 1917 from 1950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 10:
213 goes into 330 1 times with a remainder of 117.
Record the quotient 1 as the next digit in the result. 
Result so far: 29944.591
If we subtract 213 from 330, we get 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Advancing to step 11:
When dividing 1170 by 213, we get 5 with a remainder of 105.
The next digit of our result is 5. 
Result so far: 29944.5915
The remainder is 105 after subtracting 1065 from 1170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Let's proceed to step 12:
213 can be fit into 1050 4 times, resulting in a remainder of 198.
Use 4 as the next digit of our solution. 
Result so far: 29944.59154
Subtract 852 from 1050 to get 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

Moving on to step 13:
213 can be fit into 1980 9 times, resulting in a remainder of 63.
Write down 9 as next digit of the result. 
Result so far: 29944.591549
Subtracting 1917 from 1980 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 14:
213 goes into 630 2 times with a remainder of 204.
Put 2 as the next digit of the answer. 
Result so far: 29944.5915492
If we subtract 426 from 630, we get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Moving on to step 15:
213 goes into 2040 9 times with a remainder of 123.
Use 9 as the next digit of our solution. 
Result so far: 29944.59154929
If we take 1917 away from 2040, we end up with 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

The final outcome is 29944.59154929, with a leftover of 1.23e-07.