We divide 268224 by 21
The aim is to understand the frequency of 21 in 268224.

On to step 1:
21 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
The remainder is 2 after subtracting 0 from 2.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 21

Moving on to step 2:
If we divide 26 by 21, we get 1 and a remainder of 5.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 21 from 26 to get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 21

Going ahead to step 3:
21 goes into 58 2 times with a remainder of 16.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 42 from 58, we get 16.
Take the next digit (2) from the dividend and append it to 16, then repeat: 162 / 21

On to step 4:
The number 21 fits into 162 7 times, leaving a remainder of 15.
Use 7 as the next digit of our solution. 
Result so far: 127.0
If we subtract 147 from 162, we get 15.
Grab the next digit (2) from the dividend, add it to 15, then carry on: 152 / 21

On to step 5:
152 divided by 21 is 7 with a remainder of 5.
Use 7 as the next digit of our solution. 
Result so far: 1277.0
If we subtract 147 from 152, we get 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 21

Step 6:
21 goes into 54 2 times with a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 12772.0
If we take 42 away from 54, 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.

Moving on to step 7:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 12772.5
Deduct 105 from 120 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.

On to step 8:
When dividing 150 by 21, we get 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 12772.57
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 9:
30 divided by 21 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 12772.571
If we subtract 21 from 30, 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.

On to step 10:
When dividing 90 by 21, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 12772.5714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 12772.57142
Subtracting 42 from 60 leaves us 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.

On to step 12:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 12772.571428
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.

Step 13:
If we divide 120 by 21, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 12772.5714285
Subtract 105 from 120 to get 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 14:
21 can be fit into 150 7 times, resulting in a remainder of 3.
The next digit of our result is 7. 
Result so far: 12772.57142857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

After the division, we end up with 12772.57142857 and a remainder of 3e-09.