Let's divide 57018436 by 78
The aim is to understand the frequency of 78 in 57018436.

On to step 1:
If we divide 5 by 78, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 78

On to step 2:
If we divide 57 by 78, we get 0 and a remainder of 57.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 57, we end up with 57.
Grab the next digit (0) from the dividend, add it to 57, then carry on: 570 / 78

Going ahead to step 3:
78 goes into 570 7 times with a remainder of 24.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 546 from 570, we get 24.
Fetch the next digit (1) from the dividend, attach it to 24 and continue: 241 / 78

Step 4:
If we divide 241 by 78, we get 3 and a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
If we take 234 away from 241, we end up with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 78

Moving on to step 5:
When dividing 78 by 78, we get 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 731.0
The remainder is 0 after subtracting 78 from 78.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 78

Advancing to step 6:
If we divide 4 by 78, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 7310.0
Subtract 0 from 4 to get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 78

On to step 7:
78 can be fit into 43 0 times, resulting in a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 73100.0
Subtract 0 from 43 to get 43.
Take the next digit (6) from the dividend and append it to 43, then repeat: 436 / 78

Going ahead to step 8:
78 goes into 436 5 times with a remainder of 46.
Use 5 as the next digit of our solution. 
Result so far: 731005.0
If we subtract 390 from 436, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Step 9:
The number 78 fits into 460 5 times, leaving a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 731005.5
The remainder is 70 after subtracting 390 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 10:
The number 78 fits into 700 8 times, leaving a remainder of 76.
Write down 8 as next digit of the result. 
Result so far: 731005.58
Deduct 624 from 700 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 11:
78 can be fit into 760 9 times, resulting in a remainder of 58.
The next digit of our result is 9. 
Result so far: 731005.589
If we subtract 702 from 760, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 12:
If we divide 580 by 78, we get 7 and a remainder of 34.
Write down 7 as next digit of the result. 
Result so far: 731005.5897
Subtract 546 from 580 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 13:
The number 78 fits into 340 4 times, leaving a remainder of 28.
The next digit of our result is 4. 
Result so far: 731005.58974
If we take 312 away from 340, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 14:
280 divided by 78 is 3 with a remainder of 46.
Write down 3 as next digit of the result. 
Result so far: 731005.589743
If we take 234 away from 280, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 15:
460 divided by 78 is 5 with a remainder of 70.
The next digit of our result is 5. 
Result so far: 731005.5897435
The remainder is 70 after subtracting 390 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 16:
78 can be fit into 700 8 times, resulting in a remainder of 76.
The number 8 becomes the next digit in our result. 
Result so far: 731005.58974358
Subtracting 624 from 700 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final result is 731005.58974358 with a remainder of 7.6e-08.