We look at the division of 643440 by 24 
The aim is to understand the frequency of 24 in 643440.

On to step 1:
The number 24 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 24

Going ahead to step 2:
If we divide 64 by 24, we get 2 and a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 16 after subtracting 48 from 64.
Append the next digit (3) from the dividend to 16 and continue with: 163 / 24

Let's proceed to step 3:
The number 24 fits into 163 6 times, leaving a remainder of 19.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
Subtract 144 from 163 to get 19.
Grab the next digit (4) from the dividend, add it to 19, then carry on: 194 / 24

Going ahead to step 4:
The number 24 fits into 194 8 times, leaving a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 268.0
If we take 192 away from 194, we end up with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 24

Moving on to step 5:
24 divided by 24 is 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 2681.0
The remainder is 0 after subtracting 24 from 24.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 24

Let's proceed to step 6:
24 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 26810.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
24 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 26810.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
If we divide 0 by 24, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 26810.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 26810.0 with a balance of 0.0.