Let's divide 29391905 by 645
The aim is to understand the frequency of 645 in 29391905.

Going ahead to step 1:
645 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 645

Step 2:
The number 645 fits into 29 0 times, leaving a remainder of 29.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 29, we get 29.
Include the next digit (3) from the dividend after 29, then repeat: 293 / 645

Advancing to step 3:
The number 645 fits into 293 0 times, leaving a remainder of 293.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 293 and we're left with 293.
Append the next digit (9) from the dividend to 293 and continue with: 2939 / 645

Moving on to step 4:
645 can be fit into 2939 4 times, resulting in a remainder of 359.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 359 after subtracting 2580 from 2939.
Include the next digit (1) from the dividend after 359, then repeat: 3591 / 645

Moving on to step 5:
If we divide 3591 by 645, we get 5 and a remainder of 366.
Write down 5 as next digit of the result. 
Result so far: 45.0
Subtract 3225 from 3591 to get 366.
Include the next digit (9) from the dividend after 366, then repeat: 3669 / 645

Let's proceed to step 6:
The number 645 fits into 3669 5 times, leaving a remainder of 444.
Use 5 as the next digit of our solution. 
Result so far: 455.0
Deduct 3225 from 3669 and we're left with 444.
Take the next digit (0) from the dividend and append it to 444, then repeat: 4440 / 645

On to step 7:
645 can be fit into 4440 6 times, resulting in a remainder of 570.
Write down 6 as next digit of the result. 
Result so far: 4556.0
Subtract 3870 from 4440 to get 570.
Grab the next digit (5) from the dividend, add it to 570, then carry on: 5705 / 645

On to step 8:
645 can be fit into 5705 8 times, resulting in a remainder of 545.
Use 8 as the next digit of our solution. 
Result so far: 45568.0
If we subtract 5160 from 5705, we get 545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

Step 9:
The number 645 fits into 5450 8 times, leaving a remainder of 290.
The next digit of our result is 8. 
Result so far: 45568.8
If we take 5160 away from 5450, we end up with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Moving on to step 10:
If we divide 2900 by 645, we get 4 and a remainder of 320.
Write down 4 as next digit of the result. 
Result so far: 45568.84
If we subtract 2580 from 2900, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 11:
645 can be fit into 3200 4 times, resulting in a remainder of 620.
Write down 4 as next digit of the result. 
Result so far: 45568.844
Deduct 2580 from 3200 and we're left with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

The quotient of the division is 45568.844, and the remainder is 0.062.