We look at the division of 69138669 by 515 
The aim is to understand the frequency of 515 in 69138669.

Going ahead to step 1:
If we divide 6 by 515, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 515

On to step 2:
515 goes into 69 0 times with a remainder of 69.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 69 and we're left with 69.
Include the next digit (1) from the dividend after 69, then repeat: 691 / 515

Advancing to step 3:
691 divided by 515 is 1 with a remainder of 176.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 515 from 691 to get 176.
Include the next digit (3) from the dividend after 176, then repeat: 1763 / 515

Moving on to step 4:
515 can be fit into 1763 3 times, resulting in a remainder of 218.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtracting 1545 from 1763 leaves us with 218.
Fetch the next digit (8) from the dividend, attach it to 218 and continue: 2188 / 515

Advancing to step 5:
The number 515 fits into 2188 4 times, leaving a remainder of 128.
Use 4 as the next digit of our solution. 
Result so far: 134.0
Deduct 2060 from 2188 and we're left with 128.
Fetch the next digit (6) from the dividend, attach it to 128 and continue: 1286 / 515

Moving on to step 6:
1286 divided by 515 is 2 with a remainder of 256.
The number 2 becomes the next digit in our result. 
Result so far: 1342.0
If we subtract 1030 from 1286, we get 256.
Include the next digit (6) from the dividend after 256, then repeat: 2566 / 515

Advancing to step 7:
515 goes into 2566 4 times with a remainder of 506.
The next digit of our result is 4. 
Result so far: 13424.0
Subtract 2060 from 2566 to get 506.
Grab the next digit (9) from the dividend, add it to 506, then carry on: 5069 / 515

On to step 8:
5069 divided by 515 is 9 with a remainder of 434.
Use 9 as the next digit of our solution. 
Result so far: 134249.0
Deduct 4635 from 5069 and we're left with 434.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4340, and continue the process.

Advancing to step 9:
If we divide 4340 by 515, we get 8 and a remainder of 220.
The number 8 becomes the next digit in our result. 
Result so far: 134249.8
If we subtract 4120 from 4340, we get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

On to step 10:
When dividing 2200 by 515, we get 4 with a remainder of 140.
The number 4 becomes the next digit in our result. 
Result so far: 134249.84
Subtracting 2060 from 2200 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 11:
The number 515 fits into 1400 2 times, leaving a remainder of 370.
The number 2 becomes the next digit in our result. 
Result so far: 134249.842
Subtracting 1030 from 1400 leaves us with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Going ahead to step 12:
515 goes into 3700 7 times with a remainder of 95.
Use 7 as the next digit of our solution. 
Result so far: 134249.8427
If we subtract 3605 from 3700, we get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Going ahead to step 13:
If we divide 950 by 515, we get 1 and a remainder of 435.
The next digit of our result is 1. 
Result so far: 134249.84271
Subtracting 515 from 950 leaves us with 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

Advancing to step 14:
515 can be fit into 4350 8 times, resulting in a remainder of 230.
Record the quotient 8 as the next digit in the result. 
Result so far: 134249.842718
If we subtract 4120 from 4350, we get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Going ahead to step 15:
When dividing 2300 by 515, we get 4 with a remainder of 240.
Use 4 as the next digit of our solution. 
Result so far: 134249.8427184
The remainder is 240 after subtracting 2060 from 2300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 16:
2400 divided by 515 is 4 with a remainder of 340.
Record the quotient 4 as the next digit in the result. 
Result so far: 134249.84271844
If we subtract 2060 from 2400, we get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

The final result is 134249.84271844 with a remainder of 3.4e-07.