We're dividing 12780021 by 159 
The aim is to understand the frequency of 159 in 12780021.

On to step 1:
159 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 159

Going ahead to step 2:
When dividing 12 by 159, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Grab the next digit (7) from the dividend, add it to 12, then carry on: 127 / 159

Let's proceed to step 3:
159 goes into 127 0 times with a remainder of 127.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 127 to get 127.
Append the next digit (8) from the dividend to 127 and continue with: 1278 / 159

Advancing to step 4:
The number 159 fits into 1278 8 times, leaving a remainder of 6.
The next digit of our result is 8. 
Result so far: 8.0
If we take 1272 away from 1278, we end up with 6.
Fetch the next digit (0) from the dividend, attach it to 6 and continue: 60 / 159

On to step 5:
The number 159 fits into 60 0 times, leaving a remainder of 60.
The next digit of our result is 0. 
Result so far: 80.0
If we subtract 0 from 60, we get 60.
Append the next digit (0) from the dividend to 60 and continue with: 600 / 159

Advancing to step 6:
159 goes into 600 3 times with a remainder of 123.
The next digit of our result is 3. 
Result so far: 803.0
Deduct 477 from 600 and we're left with 123.
Bring next digit (2) of the dividend behind the 123 and repeat the process: 1232 / 159

Step 7:
When dividing 1232 by 159, we get 7 with a remainder of 119.
Put 7 as the next digit of the answer. 
Result so far: 8037.0
Subtract 1113 from 1232 to get 119.
Take the next digit (1) from the dividend and append it to 119, then repeat: 1191 / 159

Advancing to step 8:
When dividing 1191 by 159, we get 7 with a remainder of 78.
The number 7 becomes the next digit in our result. 
Result so far: 80377.0
Subtract 1113 from 1191 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Going ahead to step 9:
780 divided by 159 is 4 with a remainder of 144.
Put 4 as the next digit of the answer. 
Result so far: 80377.4
If we take 636 away from 780, we end up with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Advancing to step 10:
The number 159 fits into 1440 9 times, leaving a remainder of 9.
Put 9 as the next digit of the answer. 
Result so far: 80377.49
If we take 1431 away from 1440, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 11:
When dividing 90 by 159, we get 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 80377.49
The remainder is 90 after subtracting 0 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Step 12:
900 divided by 159 is 5 with a remainder of 105.
The next digit of our result is 5. 
Result so far: 80377.4905
The remainder is 105 after subtracting 795 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Moving on to step 13:
If we divide 1050 by 159, we get 6 and a remainder of 96.
Record the quotient 6 as the next digit in the result. 
Result so far: 80377.49056
Subtract 954 from 1050 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 14:
159 can be fit into 960 6 times, resulting in a remainder of 6.
Record the quotient 6 as the next digit in the result. 
Result so far: 80377.490566
Subtracting 954 from 960 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 80377.490566 with a balance of 6e-07.