We're dividing 638946 by 78 
The aim is to understand the frequency of 78 in 638946.

Let's proceed to step 1:
78 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 78

Moving on to step 2:
78 can be fit into 63 0 times, resulting in a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Bring next digit (8) of the dividend behind the 63 and repeat the process: 638 / 78

Going ahead to step 3:
78 goes into 638 8 times with a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 624 from 638, we get 14.
Bring next digit (9) of the dividend behind the 14 and repeat the process: 149 / 78

Advancing to step 4:
If we divide 149 by 78, we get 1 and a remainder of 71.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
If we subtract 78 from 149, we get 71.
Bring next digit (4) of the dividend behind the 71 and repeat the process: 714 / 78

Moving on to step 5:
When dividing 714 by 78, we get 9 with a remainder of 12.
Record the quotient 9 as the next digit in the result. 
Result so far: 819.0
Deduct 702 from 714 and we're left with 12.
Grab the next digit (6) from the dividend, add it to 12, then carry on: 126 / 78

Going ahead to step 6:
The number 78 fits into 126 1 times, leaving a remainder of 48.
Put 1 as the next digit of the answer. 
Result so far: 8191.0
Subtracting 78 from 126 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 7:
When dividing 480 by 78, we get 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 8191.6
Deduct 468 from 480 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
When dividing 120 by 78, we get 1 with a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 8191.61
Subtracting 78 from 120 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 9:
78 can be fit into 420 5 times, resulting in a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 8191.615
Subtracting 390 from 420 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 10:
If we divide 300 by 78, we get 3 and a remainder of 66.
Put 3 as the next digit of the answer. 
Result so far: 8191.6153
Subtracting 234 from 300 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 11:
78 can be fit into 660 8 times, resulting in a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 8191.61538
Subtracting 624 from 660 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 12:
The number 78 fits into 360 4 times, leaving a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 8191.615384
The remainder is 48 after subtracting 312 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 13:
78 goes into 480 6 times with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 8191.6153846
If we subtract 468 from 480, 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.

Moving on to step 14:
If we divide 120 by 78, we get 1 and a remainder of 42.
Use 1 as the next digit of our solution. 
Result so far: 8191.61538461
If we subtract 78 from 120, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

After the division, we end up with 8191.61538461 and a remainder of 4.2e-08.