Let's divide 31375019 by 78
The aim is to understand the frequency of 78 in 31375019.

Going ahead to step 1:
When dividing 3 by 78, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 78

Step 2:
The number 78 fits into 31 0 times, leaving a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Bring next digit (3) of the dividend behind the 31 and repeat the process: 313 / 78

Step 3:
If we divide 313 by 78, we get 4 and a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 312 from 313 to get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 78

Advancing to step 4:
78 goes into 17 0 times with a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 40.0
Subtract 0 from 17 to get 17.
Fetch the next digit (5) from the dividend, attach it to 17 and continue: 175 / 78

Let's proceed to step 5:
78 can be fit into 175 2 times, resulting in a remainder of 19.
Record the quotient 2 as the next digit in the result. 
Result so far: 402.0
If we subtract 156 from 175, we get 19.
Append the next digit (0) from the dividend to 19 and continue with: 190 / 78

Advancing to step 6:
190 divided by 78 is 2 with a remainder of 34.
Put 2 as the next digit of the answer. 
Result so far: 4022.0
Deduct 156 from 190 and we're left with 34.
Take the next digit (1) from the dividend and append it to 34, then repeat: 341 / 78

On to step 7:
If we divide 341 by 78, we get 4 and a remainder of 29.
Use 4 as the next digit of our solution. 
Result so far: 40224.0
Subtracting 312 from 341 leaves us with 29.
Append the next digit (9) from the dividend to 29 and continue with: 299 / 78

Going ahead to step 8:
When dividing 299 by 78, we get 3 with a remainder of 65.
The number 3 becomes the next digit in our result. 
Result so far: 402243.0
The remainder is 65 after subtracting 234 from 299.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 9:
78 goes into 650 8 times with a remainder of 26.
The number 8 becomes the next digit in our result. 
Result so far: 402243.8
If we subtract 624 from 650, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 10:
The number 78 fits into 260 3 times, leaving a remainder of 26.
The number 3 becomes the next digit in our result. 
Result so far: 402243.83
Subtract 234 from 260 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 11:
78 can be fit into 260 3 times, resulting in a remainder of 26.
The next digit of our result is 3. 
Result so far: 402243.833
Subtract 234 from 260 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The final result is 402243.833 with a remainder of 0.0026.