We look at the division of 551989 by 15 
We want to figure out the number of times 551989 can be divided by 15.

Let's proceed to step 1:
15 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 15

On to step 2:
If we divide 55 by 15, we get 3 and a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 45 from 55, we get 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 15

On to step 3:
15 can be fit into 101 6 times, resulting in a remainder of 11.
Use 6 as the next digit of our solution. 
Result so far: 36.0
The remainder is 11 after subtracting 90 from 101.
Include the next digit (9) from the dividend after 11, then repeat: 119 / 15

Let's proceed to step 4:
119 divided by 15 is 7 with a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 367.0
Deduct 105 from 119 and we're left with 14.
Include the next digit (8) from the dividend after 14, then repeat: 148 / 15

Step 5:
15 goes into 148 9 times with a remainder of 13.
The next digit of our result is 9. 
Result so far: 3679.0
Subtracting 135 from 148 leaves us with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 15

On to step 6:
139 divided by 15 is 9 with a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 36799.0
The remainder is 4 after subtracting 135 from 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
40 divided by 15 is 2 with a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 36799.2
Deduct 30 from 40 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.

Moving on to step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 36799.26
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
100 divided by 15 is 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 36799.266
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 36799.266 and a remainder of 0.001.