We look at the division of 213462 by 15 
The aim is to understand the frequency of 15 in 213462.

On to step 1:
When dividing 2 by 15, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 15

Moving on to step 2:
21 divided by 15 is 1 with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 15 from 21, we get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 15

Advancing to step 3:
15 can be fit into 63 4 times, resulting in a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Deduct 60 from 63 and we're left with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 15

On to step 4:
15 goes into 34 2 times with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 142.0
If we take 30 away from 34, we end up with 4.
Bring next digit (6) of the dividend behind the 4 and repeat the process: 46 / 15

Moving on to step 5:
When dividing 46 by 15, we get 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 1423.0
The remainder is 1 after subtracting 45 from 46.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 15

On to step 6:
15 goes into 12 0 times with a remainder of 12.
The next digit of our result is 0. 
Result so far: 14230.0
Subtract 0 from 12 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
When dividing 120 by 15, we get 8 with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 14230.8
The remainder is 0 after subtracting 120 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
If we divide 0 by 15, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 14230.8
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.

Moving on to step 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 14230.8
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.

The quotient of the division is 14230.8, and the remainder is 0.0.