We look at the division of 34435510 by 815 
The aim is to understand the frequency of 815 in 34435510.

Let's proceed to step 1:
If we divide 3 by 815, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 815

Moving on to step 2:
The number 815 fits into 34 0 times, leaving a remainder of 34.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 34 after subtracting 0 from 34.
Bring next digit (4) of the dividend behind the 34 and repeat the process: 344 / 815

Going ahead to step 3:
815 goes into 344 0 times with a remainder of 344.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 344 after subtracting 0 from 344.
Fetch the next digit (3) from the dividend, attach it to 344 and continue: 3443 / 815

Moving on to step 4:
3443 divided by 815 is 4 with a remainder of 183.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 3260 from 3443 to get 183.
Include the next digit (5) from the dividend after 183, then repeat: 1835 / 815

Advancing to step 5:
815 can be fit into 1835 2 times, resulting in a remainder of 205.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
Subtract 1630 from 1835 to get 205.
Bring next digit (5) of the dividend behind the 205 and repeat the process: 2055 / 815

On to step 6:
When dividing 2055 by 815, we get 2 with a remainder of 425.
The next digit of our result is 2. 
Result so far: 422.0
If we subtract 1630 from 2055, we get 425.
Grab the next digit (1) from the dividend, add it to 425, then carry on: 4251 / 815

Advancing to step 7:
815 goes into 4251 5 times with a remainder of 176.
Record the quotient 5 as the next digit in the result. 
Result so far: 4225.0
If we subtract 4075 from 4251, we get 176.
Grab the next digit (0) from the dividend, add it to 176, then carry on: 1760 / 815

Going ahead to step 8:
If we divide 1760 by 815, we get 2 and a remainder of 130.
Record the quotient 2 as the next digit in the result. 
Result so far: 42252.0
The remainder is 130 after subtracting 1630 from 1760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 9:
1300 divided by 815 is 1 with a remainder of 485.
Use 1 as the next digit of our solution. 
Result so far: 42252.1
Deduct 815 from 1300 and we're left with 485.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4850, and continue the process.

Moving on to step 10:
When dividing 4850 by 815, we get 5 with a remainder of 775.
Put 5 as the next digit of the answer. 
Result so far: 42252.15
Subtracting 4075 from 4850 leaves us with 775.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7750, and continue the process.

Moving on to step 11:
When dividing 7750 by 815, we get 9 with a remainder of 415.
Use 9 as the next digit of our solution. 
Result so far: 42252.159
Deduct 7335 from 7750 and we're left with 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Let's proceed to step 12:
4150 divided by 815 is 5 with a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 42252.1595
Subtracting 4075 from 4150 leaves us 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.

Step 13:
When dividing 750 by 815, we get 0 with a remainder of 750.
Put 0 as the next digit of the answer. 
Result so far: 42252.1595
Deduct 0 from 750 and we're left with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Step 14:
7500 divided by 815 is 9 with a remainder of 165.
The next digit of our result is 9. 
Result so far: 42252.159509
Subtracting 7335 from 7500 leaves us with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Step 15:
The number 815 fits into 1650 2 times, leaving a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 42252.1595092
If we subtract 1630 from 1650, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 16:
If we divide 200 by 815, we get 0 and a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 42252.1595092
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

After the division, we end up with 42252.1595092 and a remainder of 2e-07.