78053045 divided by 398 
The aim is to understand the frequency of 398 in 78053045.

On to step 1:
7 divided by 398 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 398

Going ahead to step 2:
398 goes into 78 0 times with a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Bring next digit (0) of the dividend behind the 78 and repeat the process: 780 / 398

Moving on to step 3:
When dividing 780 by 398, we get 1 with a remainder of 382.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 398 from 780, we get 382.
Append the next digit (5) from the dividend to 382 and continue with: 3825 / 398

Going ahead to step 4:
3825 divided by 398 is 9 with a remainder of 243.
The next digit of our result is 9. 
Result so far: 19.0
If we take 3582 away from 3825, we end up with 243.
Take the next digit (3) from the dividend and append it to 243, then repeat: 2433 / 398

On to step 5:
398 can be fit into 2433 6 times, resulting in a remainder of 45.
Put 6 as the next digit of the answer. 
Result so far: 196.0
If we subtract 2388 from 2433, we get 45.
Fetch the next digit (0) from the dividend, attach it to 45 and continue: 450 / 398

Moving on to step 6:
450 divided by 398 is 1 with a remainder of 52.
Write down 1 as next digit of the result. 
Result so far: 1961.0
If we take 398 away from 450, we end up with 52.
Append the next digit (4) from the dividend to 52 and continue with: 524 / 398

Moving on to step 7:
398 goes into 524 1 times with a remainder of 126.
Put 1 as the next digit of the answer. 
Result so far: 19611.0
The remainder is 126 after subtracting 398 from 524.
Append the next digit (5) from the dividend to 126 and continue with: 1265 / 398

Advancing to step 8:
1265 divided by 398 is 3 with a remainder of 71.
The next digit of our result is 3. 
Result so far: 196113.0
Subtract 1194 from 1265 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 9:
The number 398 fits into 710 1 times, leaving a remainder of 312.
Use 1 as the next digit of our solution. 
Result so far: 196113.1
Deduct 398 from 710 and we're left with 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Advancing to step 10:
398 goes into 3120 7 times with a remainder of 334.
Write down 7 as next digit of the result. 
Result so far: 196113.17
Deduct 2786 from 3120 and we're left with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Let's proceed to step 11:
If we divide 3340 by 398, we get 8 and a remainder of 156.
Put 8 as the next digit of the answer. 
Result so far: 196113.178
If we subtract 3184 from 3340, we get 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

On to step 12:
398 can be fit into 1560 3 times, resulting in a remainder of 366.
Put 3 as the next digit of the answer. 
Result so far: 196113.1783
If we take 1194 away from 1560, we end up with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Step 13:
When dividing 3660 by 398, we get 9 with a remainder of 78.
The number 9 becomes the next digit in our result. 
Result so far: 196113.17839
Subtracting 3582 from 3660 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 14:
If we divide 780 by 398, we get 1 and a remainder of 382.
The number 1 becomes the next digit in our result. 
Result so far: 196113.178391
If we take 398 away from 780, we end up with 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

On to step 15:
The number 398 fits into 3820 9 times, leaving a remainder of 238.
The number 9 becomes the next digit in our result. 
Result so far: 196113.1783919
Deduct 3582 from 3820 and we're left with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Step 16:
The number 398 fits into 2380 5 times, leaving a remainder of 390.
Use 5 as the next digit of our solution. 
Result so far: 196113.17839195
Deduct 1990 from 2380 and we're left with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

The final outcome is 196113.17839195, with a leftover of 3.9e-07.