We're dividing 15277089 by 780 
We want to figure out the number of times 15277089 can be divided by 780.

On to step 1:
The number 780 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 780

Let's proceed to step 2:
The number 780 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Fetch the next digit (2) from the dividend, attach it to 15 and continue: 152 / 780

On to step 3:
When dividing 152 by 780, we get 0 with a remainder of 152.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 152, we end up with 152.
Append the next digit (7) from the dividend to 152 and continue with: 1527 / 780

On to step 4:
When dividing 1527 by 780, we get 1 with a remainder of 747.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 780 from 1527, we get 747.
Bring next digit (7) of the dividend behind the 747 and repeat the process: 7477 / 780

Let's proceed to step 5:
When dividing 7477 by 780, we get 9 with a remainder of 457.
Use 9 as the next digit of our solution. 
Result so far: 19.0
If we subtract 7020 from 7477, we get 457.
Fetch the next digit (0) from the dividend, attach it to 457 and continue: 4570 / 780

Going ahead to step 6:
4570 divided by 780 is 5 with a remainder of 670.
Put 5 as the next digit of the answer. 
Result so far: 195.0
If we take 3900 away from 4570, we end up with 670.
Bring next digit (8) of the dividend behind the 670 and repeat the process: 6708 / 780

Advancing to step 7:
When dividing 6708 by 780, we get 8 with a remainder of 468.
Put 8 as the next digit of the answer. 
Result so far: 1958.0
Subtracting 6240 from 6708 leaves us with 468.
Append the next digit (9) from the dividend to 468 and continue with: 4689 / 780

Going ahead to step 8:
The number 780 fits into 4689 6 times, leaving a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 19586.0
If we take 4680 away from 4689, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 9:
When dividing 90 by 780, we get 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 19586.0
Subtracting 0 from 90 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 10:
900 divided by 780 is 1 with a remainder of 120.
Record the quotient 1 as the next digit in the result. 
Result so far: 19586.01
If we subtract 780 from 900, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 11:
When dividing 1200 by 780, we get 1 with a remainder of 420.
Record the quotient 1 as the next digit in the result. 
Result so far: 19586.011
The remainder is 420 after subtracting 780 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

After the division, we end up with 19586.011 and a remainder of 0.042.