Let's divide 12212251 by 15
Let's see how many times 15 fits into 12212251.

Moving on to step 1:
The number 15 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 15

Let's proceed to step 2:
If we divide 12 by 15, we get 0 and a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Append the next digit (2) from the dividend to 12 and continue with: 122 / 15

On to step 3:
When dividing 122 by 15, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we subtract 120 from 122, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 15

Going ahead to step 4:
The number 15 fits into 21 1 times, leaving a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
If we take 15 away from 21, we end up with 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 15

Step 5:
15 can be fit into 62 4 times, resulting in a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 814.0
Deduct 60 from 62 and we're left with 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 15

Advancing to step 6:
The number 15 fits into 22 1 times, leaving a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 8141.0
The remainder is 7 after subtracting 15 from 22.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 15

On to step 7:
15 can be fit into 75 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 81415.0
The remainder is 0 after subtracting 75 from 75.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 15

Step 8:
If we divide 1 by 15, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 814150.0
If we take 0 away from 1, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 9:
10 divided by 15 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 814150.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 10:
When dividing 100 by 15, we get 6 with a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 814150.06
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 11:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 814150.066
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 814150.066, with a leftover of 0.001.