We look at the division of 15157857 by 615 
The aim is to understand the frequency of 615 in 15157857.

Moving on to step 1:
When dividing 1 by 615, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 615

Step 2:
When dividing 15 by 615, we get 0 with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 615

Going ahead to step 3:
615 goes into 151 0 times with a remainder of 151.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 151 leaves us with 151.
Append the next digit (5) from the dividend to 151 and continue with: 1515 / 615

Moving on to step 4:
615 goes into 1515 2 times with a remainder of 285.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 1230 from 1515 leaves us with 285.
Bring next digit (7) of the dividend behind the 285 and repeat the process: 2857 / 615

Let's proceed to step 5:
615 goes into 2857 4 times with a remainder of 397.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Subtract 2460 from 2857 to get 397.
Append the next digit (8) from the dividend to 397 and continue with: 3978 / 615

Going ahead to step 6:
If we divide 3978 by 615, we get 6 and a remainder of 288.
The number 6 becomes the next digit in our result. 
Result so far: 246.0
If we take 3690 away from 3978, we end up with 288.
Fetch the next digit (5) from the dividend, attach it to 288 and continue: 2885 / 615

Step 7:
615 goes into 2885 4 times with a remainder of 425.
The number 4 becomes the next digit in our result. 
Result so far: 2464.0
If we take 2460 away from 2885, we end up with 425.
Include the next digit (7) from the dividend after 425, then repeat: 4257 / 615

On to step 8:
If we divide 4257 by 615, we get 6 and a remainder of 567.
Put 6 as the next digit of the answer. 
Result so far: 24646.0
If we take 3690 away from 4257, we end up with 567.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5670, and continue the process.

On to step 9:
If we divide 5670 by 615, we get 9 and a remainder of 135.
The next digit of our result is 9. 
Result so far: 24646.9
Subtracting 5535 from 5670 leaves us 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.

Going ahead to step 10:
615 goes into 1350 2 times with a remainder of 120.
The next digit of our result is 2. 
Result so far: 24646.92
Subtract 1230 from 1350 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 11:
When dividing 1200 by 615, we get 1 with a remainder of 585.
The next digit of our result is 1. 
Result so far: 24646.921
Subtracting 615 from 1200 leaves us with 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

Moving on to step 12:
5850 divided by 615 is 9 with a remainder of 315.
Put 9 as the next digit of the answer. 
Result so far: 24646.9219
If we take 5535 away from 5850, we end up with 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Advancing to step 13:
The number 615 fits into 3150 5 times, leaving a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 24646.92195
If we take 3075 away from 3150, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Let's proceed to step 14:
615 goes into 750 1 times with a remainder of 135.
The number 1 becomes the next digit in our result. 
Result so far: 24646.921951
Deduct 615 from 750 and we're left 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.

On to step 15:
615 can be fit into 1350 2 times, resulting in a remainder of 120.
Use 2 as the next digit of our solution. 
Result so far: 24646.9219512
If we subtract 1230 from 1350, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 16:
If we divide 1200 by 615, we get 1 and a remainder of 585.
The number 1 becomes the next digit in our result. 
Result so far: 24646.92195121
Subtract 615 from 1200 to get 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

The final outcome is 24646.92195121, with a leftover of 5.85e-07.