78390285 ÷ 378 
The aim is to understand the frequency of 378 in 78390285.

Going ahead to step 1:
When dividing 7 by 378, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 378

Going ahead to step 2:
378 goes into 78 0 times with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Include the next digit (3) from the dividend after 78, then repeat: 783 / 378

Advancing to step 3:
The number 378 fits into 783 2 times, leaving a remainder of 27.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 27 after subtracting 756 from 783.
Fetch the next digit (9) from the dividend, attach it to 27 and continue: 279 / 378

Let's proceed to step 4:
279 divided by 378 is 0 with a remainder of 279.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we take 0 away from 279, we end up with 279.
Fetch the next digit (0) from the dividend, attach it to 279 and continue: 2790 / 378

Step 5:
The number 378 fits into 2790 7 times, leaving a remainder of 144.
The next digit of our result is 7. 
Result so far: 207.0
The remainder is 144 after subtracting 2646 from 2790.
Grab the next digit (2) from the dividend, add it to 144, then carry on: 1442 / 378

Moving on to step 6:
The number 378 fits into 1442 3 times, leaving a remainder of 308.
The next digit of our result is 3. 
Result so far: 2073.0
If we subtract 1134 from 1442, we get 308.
Fetch the next digit (8) from the dividend, attach it to 308 and continue: 3088 / 378

Moving on to step 7:
When dividing 3088 by 378, we get 8 with a remainder of 64.
Record the quotient 8 as the next digit in the result. 
Result so far: 20738.0
The remainder is 64 after subtracting 3024 from 3088.
Take the next digit (5) from the dividend and append it to 64, then repeat: 645 / 378

Step 8:
When dividing 645 by 378, we get 1 with a remainder of 267.
The next digit of our result is 1. 
Result so far: 207381.0
Deduct 378 from 645 and we're left with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Step 9:
378 can be fit into 2670 7 times, resulting in a remainder of 24.
Record the quotient 7 as the next digit in the result. 
Result so far: 207381.7
If we subtract 2646 from 2670, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 10:
The number 378 fits into 240 0 times, leaving a remainder of 240.
Use 0 as the next digit of our solution. 
Result so far: 207381.7
Subtracting 0 from 240 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 11:
When dividing 2400 by 378, we get 6 with a remainder of 132.
Put 6 as the next digit of the answer. 
Result so far: 207381.706
Deduct 2268 from 2400 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.

Moving on to step 12:
If we divide 1320 by 378, we get 3 and a remainder of 186.
Write down 3 as next digit of the result. 
Result so far: 207381.7063
If we subtract 1134 from 1320, we get 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

Going ahead to step 13:
378 goes into 1860 4 times with a remainder of 348.
The number 4 becomes the next digit in our result. 
Result so far: 207381.70634
Deduct 1512 from 1860 and we're left with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Let's proceed to step 14:
3480 divided by 378 is 9 with a remainder of 78.
Record the quotient 9 as the next digit in the result. 
Result so far: 207381.706349
Deduct 3402 from 3480 and we're left 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.

Moving on to step 15:
If we divide 780 by 378, we get 2 and a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 207381.7063492
Deduct 756 from 780 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 16:
378 goes into 240 0 times with a remainder of 240.
The next digit of our result is 0. 
Result so far: 207381.7063492
Subtract 0 from 240 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

In conclusion, the division gives 207381.7063492 with a balance of 2.4e-07.