We divide 53220 by 15
The aim is to understand the frequency of 15 in 53220.

Step 1:
When dividing 5 by 15, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 15

On to step 2:
The number 15 fits into 53 3 times, leaving a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 45 from 53 and we're left with 8.
Append the next digit (2) from the dividend to 8 and continue with: 82 / 15

Advancing to step 3:
82 divided by 15 is 5 with a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 35.0
Deduct 75 from 82 and we're left with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 15

Going ahead to step 4:
72 divided by 15 is 4 with a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 354.0
The remainder is 12 after subtracting 60 from 72.
Include the next digit (0) from the dividend after 12, then repeat: 120 / 15

Going ahead to step 5:
The number 15 fits into 120 8 times, leaving a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 3548.0
If we take 120 away from 120, we end up 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.

On to step 6:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 3548.0
If we take 0 away from 0, we end up 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 7:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 3548.0
If we subtract 0 from 0, we 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.

The final outcome is 3548.0, with a leftover of 0.0.