We look at the division of 16218501 by 224 
The aim is to understand the frequency of 224 in 16218501.

On to step 1:
224 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 224

Let's proceed to step 2:
224 can be fit into 16 0 times, resulting in a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Grab the next digit (2) from the dividend, add it to 16, then carry on: 162 / 224

Going ahead to step 3:
When dividing 162 by 224, we get 0 with a remainder of 162.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 162 leaves us with 162.
Grab the next digit (1) from the dividend, add it to 162, then carry on: 1621 / 224

Going ahead to step 4:
When dividing 1621 by 224, we get 7 with a remainder of 53.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
The remainder is 53 after subtracting 1568 from 1621.
Take the next digit (8) from the dividend and append it to 53, then repeat: 538 / 224

Moving on to step 5:
224 goes into 538 2 times with a remainder of 90.
Put 2 as the next digit of the answer. 
Result so far: 72.0
If we subtract 448 from 538, we get 90.
Bring next digit (5) of the dividend behind the 90 and repeat the process: 905 / 224

Going ahead to step 6:
224 can be fit into 905 4 times, resulting in a remainder of 9.
Put 4 as the next digit of the answer. 
Result so far: 724.0
Subtract 896 from 905 to get 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 224

Moving on to step 7:
224 can be fit into 90 0 times, resulting in a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 7240.0
Deduct 0 from 90 and we're left with 90.
Take the next digit (1) from the dividend and append it to 90, then repeat: 901 / 224

Going ahead to step 8:
224 can be fit into 901 4 times, resulting in a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 72404.0
Subtracting 896 from 901 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 9:
The number 224 fits into 50 0 times, leaving a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 72404.0
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 10:
When dividing 500 by 224, we get 2 with a remainder of 52.
The number 2 becomes the next digit in our result. 
Result so far: 72404.02
If we take 448 away from 500, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 11:
If we divide 520 by 224, we get 2 and a remainder of 72.
Use 2 as the next digit of our solution. 
Result so far: 72404.022
The remainder is 72 after subtracting 448 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final result is 72404.022 with a remainder of 0.0072.