We divide 91103257 by 615
The aim is to understand the frequency of 615 in 91103257.

Advancing to step 1:
If we divide 9 by 615, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 615

On to step 2:
If we divide 91 by 615, we get 0 and a remainder of 91.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 91 and we're left with 91.
Fetch the next digit (1) from the dividend, attach it to 91 and continue: 911 / 615

Advancing to step 3:
When dividing 911 by 615, we get 1 with a remainder of 296.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 296 after subtracting 615 from 911.
Take the next digit (0) from the dividend and append it to 296, then repeat: 2960 / 615

On to step 4:
The number 615 fits into 2960 4 times, leaving a remainder of 500.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Subtracting 2460 from 2960 leaves us with 500.
Fetch the next digit (3) from the dividend, attach it to 500 and continue: 5003 / 615

Moving on to step 5:
If we divide 5003 by 615, we get 8 and a remainder of 83.
Write down 8 as next digit of the result. 
Result so far: 148.0
If we take 4920 away from 5003, we end up with 83.
Bring next digit (2) of the dividend behind the 83 and repeat the process: 832 / 615

Let's proceed to step 6:
615 can be fit into 832 1 times, resulting in a remainder of 217.
The number 1 becomes the next digit in our result. 
Result so far: 1481.0
The remainder is 217 after subtracting 615 from 832.
Take the next digit (5) from the dividend and append it to 217, then repeat: 2175 / 615

Going ahead to step 7:
If we divide 2175 by 615, we get 3 and a remainder of 330.
Put 3 as the next digit of the answer. 
Result so far: 14813.0
Deduct 1845 from 2175 and we're left with 330.
Grab the next digit (7) from the dividend, add it to 330, then carry on: 3307 / 615

Moving on to step 8:
The number 615 fits into 3307 5 times, leaving a remainder of 232.
The number 5 becomes the next digit in our result. 
Result so far: 148135.0
Subtracting 3075 from 3307 leaves us with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Going ahead to step 9:
The number 615 fits into 2320 3 times, leaving a remainder of 475.
The next digit of our result is 3. 
Result so far: 148135.3
Subtract 1845 from 2320 to get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Step 10:
4750 divided by 615 is 7 with a remainder of 445.
The next digit of our result is 7. 
Result so far: 148135.37
The remainder is 445 after subtracting 4305 from 4750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

On to step 11:
If we divide 4450 by 615, we get 7 and a remainder of 145.
Use 7 as the next digit of our solution. 
Result so far: 148135.377
Subtract 4305 from 4450 to get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

The final outcome is 148135.377, with a leftover of 0.0145.