378963 ÷ 19 
The aim is to understand the frequency of 19 in 378963.

Advancing to step 1:
19 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 19

Advancing to step 2:
19 can be fit into 37 1 times, resulting in a remainder of 18.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 19 from 37 and we're left with 18.
Grab the next digit (8) from the dividend, add it to 18, then carry on: 188 / 19

Advancing to step 3:
The number 19 fits into 188 9 times, leaving a remainder of 17.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we take 171 away from 188, we end up with 17.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 19

Step 4:
179 divided by 19 is 9 with a remainder of 8.
Use 9 as the next digit of our solution. 
Result so far: 199.0
If we subtract 171 from 179, we get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 19

On to step 5:
When dividing 86 by 19, we get 4 with a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 1994.0
The remainder is 10 after subtracting 76 from 86.
Bring next digit (3) of the dividend behind the 10 and repeat the process: 103 / 19

Moving on to step 6:
If we divide 103 by 19, we get 5 and a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 19945.0
If we take 95 away from 103, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 7:
The number 19 fits into 80 4 times, leaving a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 19945.4
The remainder is 4 after subtracting 76 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 8:
When dividing 40 by 19, we get 2 with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 19945.42
Subtract 38 from 40 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 9:
19 can be fit into 20 1 times, resulting in a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 19945.421
Deduct 19 from 20 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 10:
19 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 19945.421
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 11:
When dividing 100 by 19, we get 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 19945.42105
Subtract 95 from 100 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 12:
19 can be fit into 50 2 times, resulting in a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 19945.421052
If we subtract 38 from 50, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 13:
19 can be fit into 120 6 times, resulting in a remainder of 6.
Use 6 as the next digit of our solution. 
Result so far: 19945.4210526
If we take 114 away from 120, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 14:
When dividing 60 by 19, we get 3 with a remainder of 3.
The next digit of our result is 3. 
Result so far: 19945.42105263
If we take 57 away from 60, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

After the division, we end up with 19945.42105263 and a remainder of 3e-09.