24209694 ÷ 645 
The aim is to understand the frequency of 645 in 24209694.

Moving on to step 1:
2 divided by 645 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 645

Advancing to step 2:
24 divided by 645 is 0 with a remainder of 24.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 24 leaves us with 24.
Append the next digit (2) from the dividend to 24 and continue with: 242 / 645

Let's proceed to step 3:
645 goes into 242 0 times with a remainder of 242.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 242 leaves us with 242.
Take the next digit (0) from the dividend and append it to 242, then repeat: 2420 / 645

Step 4:
If we divide 2420 by 645, we get 3 and a remainder of 485.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 1935 from 2420 and we're left with 485.
Append the next digit (9) from the dividend to 485 and continue with: 4859 / 645

Going ahead to step 5:
If we divide 4859 by 645, we get 7 and a remainder of 344.
Record the quotient 7 as the next digit in the result. 
Result so far: 37.0
If we take 4515 away from 4859, we end up with 344.
Take the next digit (6) from the dividend and append it to 344, then repeat: 3446 / 645

Step 6:
If we divide 3446 by 645, we get 5 and a remainder of 221.
The next digit of our result is 5. 
Result so far: 375.0
The remainder is 221 after subtracting 3225 from 3446.
Include the next digit (9) from the dividend after 221, then repeat: 2219 / 645

Advancing to step 7:
The number 645 fits into 2219 3 times, leaving a remainder of 284.
The number 3 becomes the next digit in our result. 
Result so far: 3753.0
If we take 1935 away from 2219, we end up with 284.
Bring next digit (4) of the dividend behind the 284 and repeat the process: 2844 / 645

Advancing to step 8:
If we divide 2844 by 645, we get 4 and a remainder of 264.
The next digit of our result is 4. 
Result so far: 37534.0
If we subtract 2580 from 2844, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

On to step 9:
The number 645 fits into 2640 4 times, leaving a remainder of 60.
Put 4 as the next digit of the answer. 
Result so far: 37534.4
Subtracting 2580 from 2640 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 10:
645 goes into 600 0 times with a remainder of 600.
Record the quotient 0 as the next digit in the result. 
Result so far: 37534.4
Deduct 0 from 600 and we're left with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

On to step 11:
The number 645 fits into 6000 9 times, leaving a remainder of 195.
Put 9 as the next digit of the answer. 
Result so far: 37534.409
If we take 5805 away from 6000, we end up with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

On to step 12:
1950 divided by 645 is 3 with a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 37534.4093
Deduct 1935 from 1950 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 13:
If we divide 150 by 645, we get 0 and a remainder of 150.
The number 0 becomes the next digit in our result. 
Result so far: 37534.4093
If we subtract 0 from 150, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Moving on to step 14:
When dividing 1500 by 645, we get 2 with a remainder of 210.
The next digit of our result is 2. 
Result so far: 37534.409302
The remainder is 210 after subtracting 1290 from 1500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Step 15:
645 goes into 2100 3 times with a remainder of 165.
The number 3 becomes the next digit in our result. 
Result so far: 37534.4093023
The remainder is 165 after subtracting 1935 from 2100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

On to step 16:
The number 645 fits into 1650 2 times, leaving a remainder of 360.
The next digit of our result is 2. 
Result so far: 37534.40930232
Subtract 1290 from 1650 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

After the division, we end up with 37534.40930232 and a remainder of 3.6e-07.