We divide 780900 by 77
We want to figure out the number of times 780900 can be divided by 77.

Moving on to step 1:
If we divide 7 by 77, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 77

Advancing to step 2:
If we divide 78 by 77, we get 1 and a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 77 from 78 leaves us with 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 77

Advancing to step 3:
77 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
If we take 0 away from 10, we end up with 10.
Grab the next digit (9) from the dividend, add it to 10, then carry on: 109 / 77

Let's proceed to step 4:
77 goes into 109 1 times with a remainder of 32.
Use 1 as the next digit of our solution. 
Result so far: 101.0
Deduct 77 from 109 and we're left with 32.
Append the next digit (0) from the dividend to 32 and continue with: 320 / 77

On to step 5:
The number 77 fits into 320 4 times, leaving a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 1014.0
If we subtract 308 from 320, we get 12.
Fetch the next digit (0) from the dividend, attach it to 12 and continue: 120 / 77

Let's proceed to step 6:
When dividing 120 by 77, we get 1 with a remainder of 43.
Write down 1 as next digit of the result. 
Result so far: 10141.0
Deduct 77 from 120 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 7:
77 can be fit into 430 5 times, resulting in a remainder of 45.
The next digit of our result is 5. 
Result so far: 10141.5
If we subtract 385 from 430, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 8:
450 divided by 77 is 5 with a remainder of 65.
The next digit of our result is 5. 
Result so far: 10141.55
If we take 385 away from 450, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

The final result is 10141.55 with a remainder of 0.065.