We're dividing 75567615 by 378 
The aim is to understand the frequency of 378 in 75567615.

On to step 1:
378 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 378

Let's proceed to step 2:
75 divided by 378 is 0 with a remainder of 75.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 75 leaves us with 75.
Append the next digit (5) from the dividend to 75 and continue with: 755 / 378

On to step 3:
755 divided by 378 is 1 with a remainder of 377.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 378 from 755, we get 377.
Append the next digit (6) from the dividend to 377 and continue with: 3776 / 378

Step 4:
378 can be fit into 3776 9 times, resulting in a remainder of 374.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
If we subtract 3402 from 3776, we get 374.
Fetch the next digit (7) from the dividend, attach it to 374 and continue: 3747 / 378

On to step 5:
The number 378 fits into 3747 9 times, leaving a remainder of 345.
The number 9 becomes the next digit in our result. 
Result so far: 199.0
If we take 3402 away from 3747, we end up with 345.
Bring next digit (6) of the dividend behind the 345 and repeat the process: 3456 / 378

Going ahead to step 6:
When dividing 3456 by 378, we get 9 with a remainder of 54.
Write down 9 as next digit of the result. 
Result so far: 1999.0
If we subtract 3402 from 3456, we get 54.
Bring next digit (1) of the dividend behind the 54 and repeat the process: 541 / 378

Let's proceed to step 7:
The number 378 fits into 541 1 times, leaving a remainder of 163.
The number 1 becomes the next digit in our result. 
Result so far: 19991.0
Subtracting 378 from 541 leaves us with 163.
Fetch the next digit (5) from the dividend, attach it to 163 and continue: 1635 / 378

Advancing to step 8:
If we divide 1635 by 378, we get 4 and a remainder of 123.
Use 4 as the next digit of our solution. 
Result so far: 199914.0
Subtracting 1512 from 1635 leaves us 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.

Moving on to step 9:
When dividing 1230 by 378, we get 3 with a remainder of 96.
Record the quotient 3 as the next digit in the result. 
Result so far: 199914.3
If we subtract 1134 from 1230, we get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 10:
378 can be fit into 960 2 times, resulting in a remainder of 204.
Record the quotient 2 as the next digit in the result. 
Result so far: 199914.32
If we take 756 away from 960, we end up with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Advancing to step 11:
If we divide 2040 by 378, we get 5 and a remainder of 150.
Put 5 as the next digit of the answer. 
Result so far: 199914.325
The remainder is 150 after subtracting 1890 from 2040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 12:
When dividing 1500 by 378, we get 3 with a remainder of 366.
Write down 3 as next digit of the result. 
Result so far: 199914.3253
If we take 1134 away from 1500, 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.

Moving on to step 13:
3660 divided by 378 is 9 with a remainder of 258.
Put 9 as the next digit of the answer. 
Result so far: 199914.32539
Subtracting 3402 from 3660 leaves us with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Advancing to step 14:
2580 divided by 378 is 6 with a remainder of 312.
Write down 6 as next digit of the result. 
Result so far: 199914.325396
Subtract 2268 from 2580 to get 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Going ahead to step 15:
If we divide 3120 by 378, we get 8 and a remainder of 96.
The next digit of our result is 8. 
Result so far: 199914.3253968
If we subtract 3024 from 3120, we get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 16:
The number 378 fits into 960 2 times, leaving a remainder of 204.
Use 2 as the next digit of our solution. 
Result so far: 199914.32539682
Subtracting 756 from 960 leaves us with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

After the division, we end up with 199914.32539682 and a remainder of 2.04e-07.