We look at the division of 21578311 by 735 
The aim is to understand the frequency of 735 in 21578311.

Let's proceed to step 1:
735 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 735

Moving on to step 2:
The number 735 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Fetch the next digit (5) from the dividend, attach it to 21 and continue: 215 / 735

Advancing to step 3:
The number 735 fits into 215 0 times, leaving a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 215 after subtracting 0 from 215.
Grab the next digit (7) from the dividend, add it to 215, then carry on: 2157 / 735

Let's proceed to step 4:
If we divide 2157 by 735, we get 2 and a remainder of 687.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 1470 from 2157 to get 687.
Take the next digit (8) from the dividend and append it to 687, then repeat: 6878 / 735

Let's proceed to step 5:
735 goes into 6878 9 times with a remainder of 263.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
If we take 6615 away from 6878, we end up with 263.
Take the next digit (3) from the dividend and append it to 263, then repeat: 2633 / 735

Step 6:
735 goes into 2633 3 times with a remainder of 428.
The next digit of our result is 3. 
Result so far: 293.0
Subtracting 2205 from 2633 leaves us with 428.
Grab the next digit (1) from the dividend, add it to 428, then carry on: 4281 / 735

Step 7:
4281 divided by 735 is 5 with a remainder of 606.
The next digit of our result is 5. 
Result so far: 2935.0
Subtracting 3675 from 4281 leaves us with 606.
Bring next digit (1) of the dividend behind the 606 and repeat the process: 6061 / 735

Let's proceed to step 8:
735 can be fit into 6061 8 times, resulting in a remainder of 181.
The number 8 becomes the next digit in our result. 
Result so far: 29358.0
If we take 5880 away from 6061, we end up with 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Let's proceed to step 9:
When dividing 1810 by 735, we get 2 with a remainder of 340.
Use 2 as the next digit of our solution. 
Result so far: 29358.2
If we subtract 1470 from 1810, 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.

Advancing to step 10:
735 goes into 3400 4 times with a remainder of 460.
Put 4 as the next digit of the answer. 
Result so far: 29358.24
Subtract 2940 from 3400 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

On to step 11:
If we divide 4600 by 735, we get 6 and a remainder of 190.
Record the quotient 6 as the next digit in the result. 
Result so far: 29358.246
If we take 4410 away from 4600, we end up with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Advancing to step 12:
The number 735 fits into 1900 2 times, leaving a remainder of 430.
The number 2 becomes the next digit in our result. 
Result so far: 29358.2462
The remainder is 430 after subtracting 1470 from 1900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Advancing to step 13:
When dividing 4300 by 735, we get 5 with a remainder of 625.
Put 5 as the next digit of the answer. 
Result so far: 29358.24625
The remainder is 625 after subtracting 3675 from 4300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6250, and continue the process.

On to step 14:
If we divide 6250 by 735, we get 8 and a remainder of 370.
Put 8 as the next digit of the answer. 
Result so far: 29358.246258
Subtracting 5880 from 6250 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.

On to step 15:
If we divide 3700 by 735, we get 5 and a remainder of 25.
The next digit of our result is 5. 
Result so far: 29358.2462585
Subtracting 3675 from 3700 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 16:
If we divide 250 by 735, we get 0 and a remainder of 250.
Record the quotient 0 as the next digit in the result. 
Result so far: 29358.2462585
The remainder is 250 after subtracting 0 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

The final result is 29358.2462585 with a remainder of 2.5e-07.