We look at the division of 38911604 by 863 
The aim is to understand the frequency of 863 in 38911604.

On to step 1:
3 divided by 863 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 863

Moving on to step 2:
When dividing 38 by 863, we get 0 with a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 38 leaves us with 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 863

Advancing to step 3:
863 can be fit into 389 0 times, resulting in a remainder of 389.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 389 to get 389.
Append the next digit (1) from the dividend to 389 and continue with: 3891 / 863

Going ahead to step 4:
863 goes into 3891 4 times with a remainder of 439.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 3452 from 3891 to get 439.
Grab the next digit (1) from the dividend, add it to 439, then carry on: 4391 / 863

Going ahead to step 5:
863 can be fit into 4391 5 times, resulting in a remainder of 76.
Use 5 as the next digit of our solution. 
Result so far: 45.0
Deduct 4315 from 4391 and we're left with 76.
Fetch the next digit (6) from the dividend, attach it to 76 and continue: 766 / 863

Moving on to step 6:
If we divide 766 by 863, we get 0 and a remainder of 766.
Record the quotient 0 as the next digit in the result. 
Result so far: 450.0
If we take 0 away from 766, we end up with 766.
Append the next digit (0) from the dividend to 766 and continue with: 7660 / 863

Let's proceed to step 7:
7660 divided by 863 is 8 with a remainder of 756.
Write down 8 as next digit of the result. 
Result so far: 4508.0
Subtracting 6904 from 7660 leaves us with 756.
Grab the next digit (4) from the dividend, add it to 756, then carry on: 7564 / 863

Going ahead to step 8:
When dividing 7564 by 863, we get 8 with a remainder of 660.
Record the quotient 8 as the next digit in the result. 
Result so far: 45088.0
Deduct 6904 from 7564 and we're left with 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6600, and continue the process.

On to step 9:
863 can be fit into 6600 7 times, resulting in a remainder of 559.
Use 7 as the next digit of our solution. 
Result so far: 45088.7
Subtracting 6041 from 6600 leaves us with 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

Advancing to step 10:
If we divide 5590 by 863, we get 6 and a remainder of 412.
The number 6 becomes the next digit in our result. 
Result so far: 45088.76
If we subtract 5178 from 5590, we get 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Let's proceed to step 11:
If we divide 4120 by 863, we get 4 and a remainder of 668.
Write down 4 as next digit of the result. 
Result so far: 45088.764
Subtracting 3452 from 4120 leaves us with 668.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6680, and continue the process.

Let's proceed to step 12:
6680 divided by 863 is 7 with a remainder of 639.
The next digit of our result is 7. 
Result so far: 45088.7647
Deduct 6041 from 6680 and we're left with 639.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6390, and continue the process.

Going ahead to step 13:
When dividing 6390 by 863, we get 7 with a remainder of 349.
Use 7 as the next digit of our solution. 
Result so far: 45088.76477
If we subtract 6041 from 6390, we get 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

The quotient of the division is 45088.76477, and the remainder is 0.000349.