We divide 3978150 by 198
The aim is to understand the frequency of 198 in 3978150.

Moving on to step 1:
The number 198 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 198

Let's proceed to step 2:
The number 198 fits into 39 0 times, leaving a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Append the next digit (7) from the dividend to 39 and continue with: 397 / 198

Step 3:
198 can be fit into 397 2 times, resulting in a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 396 away from 397, we end up with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 198

On to step 4:
The number 198 fits into 18 0 times, leaving a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 20.0
If we take 0 away from 18, we end up with 18.
Grab the next digit (1) from the dividend, add it to 18, then carry on: 181 / 198

Going ahead to step 5:
When dividing 181 by 198, we get 0 with a remainder of 181.
The next digit of our result is 0. 
Result so far: 200.0
Subtracting 0 from 181 leaves us with 181.
Bring next digit (5) of the dividend behind the 181 and repeat the process: 1815 / 198

Going ahead to step 6:
When dividing 1815 by 198, we get 9 with a remainder of 33.
Write down 9 as next digit of the result. 
Result so far: 2009.0
Subtracting 1782 from 1815 leaves us with 33.
Append the next digit (0) from the dividend to 33 and continue with: 330 / 198

Step 7:
330 divided by 198 is 1 with a remainder of 132.
The number 1 becomes the next digit in our result. 
Result so far: 20091.0
Subtracting 198 from 330 leaves us with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Step 8:
1320 divided by 198 is 6 with a remainder of 132.
Put 6 as the next digit of the answer. 
Result so far: 20091.6
Subtract 1188 from 1320 to get 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Moving on to step 9:
198 can be fit into 1320 6 times, resulting in a remainder of 132.
Record the quotient 6 as the next digit in the result. 
Result so far: 20091.66
Deduct 1188 from 1320 and we're left with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

The final result is 20091.66 with a remainder of 0.132.