57070990 divided by 15 
Our goal is to divide 57070990 by 15.

Going ahead to step 1:
15 goes into 5 0 times with 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 (7) from the dividend, add it to 5, then carry on: 57 / 15

Going ahead to step 2:
15 can be fit into 57 3 times, resulting in a remainder of 12.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 45 from 57 to get 12.
Include the next digit (0) from the dividend after 12, then repeat: 120 / 15

Going ahead to step 3:
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: 38.0
Subtracting 120 from 120 leaves us with 0.
Include the next digit (7) from the dividend after 0, then repeat: 7 / 15

Going ahead to step 4:
15 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 380.0
Subtract 0 from 7 to get 7.
Bring next digit (0) of the dividend behind the 7 and repeat the process: 70 / 15

Going ahead to step 5:
15 can be fit into 70 4 times, resulting in a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 3804.0
The remainder is 10 after subtracting 60 from 70.
Take the next digit (9) from the dividend and append it to 10, then repeat: 109 / 15

Advancing to step 6:
15 goes into 109 7 times with a remainder of 4.
The next digit of our result is 7. 
Result so far: 38047.0
If we take 105 away from 109, we end up with 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 15

Let's proceed to step 7:
If we divide 49 by 15, we get 3 and a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 380473.0
Deduct 45 from 49 and we're left with 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 15

Moving on to step 8:
15 goes into 40 2 times with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 3804732.0
If we take 30 away from 40, we end up 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.

On to step 9:
100 divided by 15 is 6 with a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 3804732.6
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.

Moving on to step 10:
If we divide 100 by 15, we get 6 and a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 3804732.66
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 3804732.66, with a leftover of 0.01.