79807894 divided by 257 
The aim is to understand the frequency of 257 in 79807894.

On to step 1:
The number 257 fits into 7 0 times, leaving a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 257

Let's proceed to step 2:
When dividing 79 by 257, we get 0 with a remainder of 79.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 79 to get 79.
Bring next digit (8) of the dividend behind the 79 and repeat the process: 798 / 257

Moving on to step 3:
The number 257 fits into 798 3 times, leaving a remainder of 27.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 27 after subtracting 771 from 798.
Append the next digit (0) from the dividend to 27 and continue with: 270 / 257

On to step 4:
257 goes into 270 1 times with a remainder of 13.
The next digit of our result is 1. 
Result so far: 31.0
Subtract 257 from 270 to get 13.
Grab the next digit (7) from the dividend, add it to 13, then carry on: 137 / 257

Advancing to step 5:
If we divide 137 by 257, we get 0 and a remainder of 137.
The number 0 becomes the next digit in our result. 
Result so far: 310.0
The remainder is 137 after subtracting 0 from 137.
Grab the next digit (8) from the dividend, add it to 137, then carry on: 1378 / 257

Step 6:
1378 divided by 257 is 5 with a remainder of 93.
The next digit of our result is 5. 
Result so far: 3105.0
If we subtract 1285 from 1378, we get 93.
Take the next digit (9) from the dividend and append it to 93, then repeat: 939 / 257

On to step 7:
If we divide 939 by 257, we get 3 and a remainder of 168.
The number 3 becomes the next digit in our result. 
Result so far: 31053.0
If we subtract 771 from 939, we get 168.
Bring next digit (4) of the dividend behind the 168 and repeat the process: 1684 / 257

Let's proceed to step 8:
If we divide 1684 by 257, we get 6 and a remainder of 142.
Use 6 as the next digit of our solution. 
Result so far: 310536.0
If we take 1542 away from 1684, we end up with 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Let's proceed to step 9:
257 can be fit into 1420 5 times, resulting in a remainder of 135.
Put 5 as the next digit of the answer. 
Result so far: 310536.5
Subtract 1285 from 1420 to get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Advancing to step 10:
If we divide 1350 by 257, we get 5 and a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 310536.55
If we subtract 1285 from 1350, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

The final outcome is 310536.55, with a leftover of 0.065.