Let's divide 870199 by 15
Our goal is to divide 870199 by 15.

On to step 1:
If we divide 8 by 15, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 15

Moving on to step 2:
If we divide 87 by 15, we get 5 and a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 75 away from 87, we end up with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 15

Let's proceed to step 3:
When dividing 120 by 15, we get 8 with a remainder of 0.
The next digit of our result is 8. 
Result so far: 58.0
Subtracting 120 from 120 leaves us with 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 15

Advancing to step 4:
When dividing 1 by 15, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 580.0
If we subtract 0 from 1, we get 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 15

Moving on to step 5:
15 goes into 19 1 times with a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 5801.0
The remainder is 4 after subtracting 15 from 19.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 15

On to step 6:
If we divide 49 by 15, we get 3 and a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 58013.0
If we subtract 45 from 49, we get 4.
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.
Use 2 as the next digit of our solution. 
Result so far: 58013.2
Subtract 30 from 40 to 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.

Moving on to step 8:
15 goes into 100 6 times with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 58013.26
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 9:
15 goes into 100 6 times with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 58013.266
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 58013.266 and a remainder of 0.001.