We're dividing 12913955 by 780 
The aim is to understand the frequency of 780 in 12913955.

Step 1:
1 divided by 780 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 780

On to step 2:
The number 780 fits into 12 0 times, leaving a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 780

Step 3:
The number 780 fits into 129 0 times, leaving a remainder of 129.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 129 to get 129.
Take the next digit (1) from the dividend and append it to 129, then repeat: 1291 / 780

On to step 4:
780 can be fit into 1291 1 times, resulting in a remainder of 511.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 511 after subtracting 780 from 1291.
Include the next digit (3) from the dividend after 511, then repeat: 5113 / 780

Advancing to step 5:
The number 780 fits into 5113 6 times, leaving a remainder of 433.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
The remainder is 433 after subtracting 4680 from 5113.
Append the next digit (9) from the dividend to 433 and continue with: 4339 / 780

On to step 6:
If we divide 4339 by 780, we get 5 and a remainder of 439.
Record the quotient 5 as the next digit in the result. 
Result so far: 165.0
Subtracting 3900 from 4339 leaves us with 439.
Append the next digit (5) from the dividend to 439 and continue with: 4395 / 780

On to step 7:
If we divide 4395 by 780, we get 5 and a remainder of 495.
Put 5 as the next digit of the answer. 
Result so far: 1655.0
Subtract 3900 from 4395 to get 495.
Append the next digit (5) from the dividend to 495 and continue with: 4955 / 780

Step 8:
When dividing 4955 by 780, we get 6 with a remainder of 275.
Write down 6 as next digit of the result. 
Result so far: 16556.0
The remainder is 275 after subtracting 4680 from 4955.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Going ahead to step 9:
2750 divided by 780 is 3 with a remainder of 410.
The number 3 becomes the next digit in our result. 
Result so far: 16556.3
If we take 2340 away from 2750, we end up with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Going ahead to step 10:
780 can be fit into 4100 5 times, resulting in a remainder of 200.
Record the quotient 5 as the next digit in the result. 
Result so far: 16556.35
Subtracting 3900 from 4100 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 11:
780 can be fit into 2000 2 times, resulting in a remainder of 440.
Put 2 as the next digit of the answer. 
Result so far: 16556.352
If we subtract 1560 from 2000, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Advancing to step 12:
4400 divided by 780 is 5 with a remainder of 500.
The number 5 becomes the next digit in our result. 
Result so far: 16556.3525
If we subtract 3900 from 4400, we get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Moving on to step 13:
780 can be fit into 5000 6 times, resulting in a remainder of 320.
Use 6 as the next digit of our solution. 
Result so far: 16556.35256
Subtract 4680 from 5000 to get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Moving on to step 14:
When dividing 3200 by 780, we get 4 with a remainder of 80.
Write down 4 as next digit of the result. 
Result so far: 16556.352564
Deduct 3120 from 3200 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 15:
780 goes into 800 1 times with a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 16556.3525641
If we subtract 780 from 800, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 16:
780 goes into 200 0 times with a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 16556.3525641
Subtract 0 from 200 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final outcome is 16556.3525641, with a leftover of 2e-07.