181881 divided by 15 
The aim is to understand the frequency of 15 in 181881.

Going ahead to step 1:
1 divided by 15 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 15

Let's proceed to step 2:
When dividing 18 by 15, we get 1 with a remainder of 3.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 3 after subtracting 15 from 18.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 15

Advancing to step 3:
15 can be fit into 31 2 times, resulting in a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtract 30 from 31 to get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 15

Going ahead to step 4:
If we divide 18 by 15, we get 1 and a remainder of 3.
The next digit of our result is 1. 
Result so far: 121.0
If we subtract 15 from 18, we get 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 15

Going ahead to step 5:
If we divide 38 by 15, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 1212.0
If we take 30 away from 38, we end up with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 15

Let's proceed to step 6:
If we divide 81 by 15, we get 5 and a remainder of 6.
Put 5 as the next digit of the answer. 
Result so far: 12125.0
The remainder is 6 after subtracting 75 from 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
15 goes into 60 4 times with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 12125.4
The remainder is 0 after subtracting 60 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 12125.4
The remainder is 0 after subtracting 0 from 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 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 12125.4
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 12125.4, with a leftover of 0.0.