77941228 divided by 515 
The aim is to understand the frequency of 515 in 77941228.

Advancing to step 1:
7 divided by 515 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 515

Going ahead to step 2:
515 can be fit into 77 0 times, resulting in a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 77 leaves us with 77.
Grab the next digit (9) from the dividend, add it to 77, then carry on: 779 / 515

Moving on to step 3:
515 goes into 779 1 times with a remainder of 264.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 515 from 779 to get 264.
Append the next digit (4) from the dividend to 264 and continue with: 2644 / 515

Going ahead to step 4:
515 goes into 2644 5 times with a remainder of 69.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 69 after subtracting 2575 from 2644.
Include the next digit (1) from the dividend after 69, then repeat: 691 / 515

Let's proceed to step 5:
691 divided by 515 is 1 with a remainder of 176.
Write down 1 as next digit of the result. 
Result so far: 151.0
Deduct 515 from 691 and we're left with 176.
Grab the next digit (2) from the dividend, add it to 176, then carry on: 1762 / 515

Let's proceed to step 6:
515 goes into 1762 3 times with a remainder of 217.
Write down 3 as next digit of the result. 
Result so far: 1513.0
If we subtract 1545 from 1762, we get 217.
Grab the next digit (2) from the dividend, add it to 217, then carry on: 2172 / 515

Going ahead to step 7:
If we divide 2172 by 515, we get 4 and a remainder of 112.
Record the quotient 4 as the next digit in the result. 
Result so far: 15134.0
Deduct 2060 from 2172 and we're left with 112.
Bring next digit (8) of the dividend behind the 112 and repeat the process: 1128 / 515

Let's proceed to step 8:
515 goes into 1128 2 times with a remainder of 98.
The next digit of our result is 2. 
Result so far: 151342.0
If we subtract 1030 from 1128, we get 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

On to step 9:
980 divided by 515 is 1 with a remainder of 465.
The number 1 becomes the next digit in our result. 
Result so far: 151342.1
Subtracting 515 from 980 leaves us with 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Moving on to step 10:
The number 515 fits into 4650 9 times, leaving a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 151342.19
If we take 4635 away from 4650, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 11:
If we divide 150 by 515, we get 0 and a remainder of 150.
Record the quotient 0 as the next digit in the result. 
Result so far: 151342.19
Subtract 0 from 150 to get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Let's proceed to step 12:
If we divide 1500 by 515, we get 2 and a remainder of 470.
The number 2 becomes the next digit in our result. 
Result so far: 151342.1902
Subtract 1030 from 1500 to get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Advancing to step 13:
515 goes into 4700 9 times with a remainder of 65.
Use 9 as the next digit of our solution. 
Result so far: 151342.19029
The remainder is 65 after subtracting 4635 from 4700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 14:
650 divided by 515 is 1 with a remainder of 135.
The number 1 becomes the next digit in our result. 
Result so far: 151342.190291
If we take 515 away from 650, we end up with 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Let's proceed to step 15:
515 can be fit into 1350 2 times, resulting in a remainder of 320.
Put 2 as the next digit of the answer. 
Result so far: 151342.1902912
The remainder is 320 after subtracting 1030 from 1350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 16:
515 goes into 3200 6 times with a remainder of 110.
Record the quotient 6 as the next digit in the result. 
Result so far: 151342.19029126
Deduct 3090 from 3200 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

The final outcome is 151342.19029126, with a leftover of 1.1e-07.