We divide 421257 by 24
The aim is to understand the frequency of 24 in 421257.

Going ahead to step 1:
The number 24 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 24

Moving on to step 2:
The number 24 fits into 42 1 times, leaving a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 24 from 42, we get 18.
Bring next digit (1) of the dividend behind the 18 and repeat the process: 181 / 24

Moving on to step 3:
181 divided by 24 is 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 17.0
The remainder is 13 after subtracting 168 from 181.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 24

Moving on to step 4:
24 goes into 132 5 times with a remainder of 12.
Write down 5 as next digit of the result. 
Result so far: 175.0
Subtract 120 from 132 to get 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 24

Let's proceed to step 5:
The number 24 fits into 125 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 1755.0
If we subtract 120 from 125, we get 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 24

Let's proceed to step 6:
24 can be fit into 57 2 times, resulting in a remainder of 9.
The next digit of our result is 2. 
Result so far: 17552.0
If we subtract 48 from 57, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
When dividing 90 by 24, we get 3 with a remainder of 18.
Put 3 as the next digit of the answer. 
Result so far: 17552.3
If we take 72 away from 90, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 8:
24 can be fit into 180 7 times, resulting in a remainder of 12.
The number 7 becomes the next digit in our result. 
Result so far: 17552.37
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
24 can be fit into 120 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 17552.375
Subtract 120 from 120 to get 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 10:
24 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 17552.375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 11:
0 divided by 24 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 17552.375
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.

The final outcome is 17552.375, with a leftover of 0.0.