Let's divide 57438 by 78
The aim is to understand the frequency of 78 in 57438.

Step 1:
When dividing 5 by 78, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 78

Moving on to step 2:
If we divide 57 by 78, we get 0 and a remainder of 57.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 57, we end up with 57.
Append the next digit (4) from the dividend to 57 and continue with: 574 / 78

Advancing to step 3:
78 can be fit into 574 7 times, resulting in a remainder of 28.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 28 after subtracting 546 from 574.
Bring next digit (3) of the dividend behind the 28 and repeat the process: 283 / 78

Moving on to step 4:
When dividing 283 by 78, we get 3 with a remainder of 49.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
The remainder is 49 after subtracting 234 from 283.
Fetch the next digit (8) from the dividend, attach it to 49 and continue: 498 / 78

On to step 5:
The number 78 fits into 498 6 times, leaving a remainder of 30.
Record the quotient 6 as the next digit in the result. 
Result so far: 736.0
If we take 468 away from 498, we end up 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.

On to step 6:
78 can be fit into 300 3 times, resulting in a remainder of 66.
Record the quotient 3 as the next digit in the result. 
Result so far: 736.3
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.

Moving on to step 7:
When dividing 660 by 78, we get 8 with a remainder of 36.
The number 8 becomes the next digit in our result. 
Result so far: 736.38
Deduct 624 from 660 and we're left 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.

Moving on to step 8:
The number 78 fits into 360 4 times, leaving a remainder of 48.
The number 4 becomes the next digit in our result. 
Result so far: 736.384
Subtracting 312 from 360 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.

Moving on to step 9:
If we divide 480 by 78, we get 6 and a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 736.3846
The remainder is 12 after subtracting 468 from 480.
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 10:
The number 78 fits into 120 1 times, leaving a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 736.38461
The remainder is 42 after subtracting 78 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 11:
78 goes into 420 5 times with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 736.384615
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.

On to step 12:
78 goes into 300 3 times with a remainder of 66.
The number 3 becomes the next digit in our result. 
Result so far: 736.3846153
Subtract 234 from 300 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 13:
The number 78 fits into 660 8 times, leaving a remainder of 36.
The number 8 becomes the next digit in our result. 
Result so far: 736.38461538
If we take 624 away from 660, we end up 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.

After the division, we end up with 736.38461538 and a remainder of 3.6e-08.