We're dividing 776904 by 21 
We want to figure out the number of times 776904 can be divided by 21.

Let's proceed to step 1:
21 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 21

Step 2:
If we divide 77 by 21, we get 3 and a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 63 from 77 and we're left with 14.
Take the next digit (6) from the dividend and append it to 14, then repeat: 146 / 21

Step 3:
The number 21 fits into 146 6 times, leaving a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 36.0
If we take 126 away from 146, we end up with 20.
Append the next digit (9) from the dividend to 20 and continue with: 209 / 21

Step 4:
When dividing 209 by 21, we get 9 with a remainder of 20.
Record the quotient 9 as the next digit in the result. 
Result so far: 369.0
If we take 189 away from 209, we end up with 20.
Include the next digit (0) from the dividend after 20, then repeat: 200 / 21

Step 5:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 3699.0
Subtract 189 from 200 to get 11.
Fetch the next digit (4) from the dividend, attach it to 11 and continue: 114 / 21

On to step 6:
The number 21 fits into 114 5 times, leaving a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 36995.0
The remainder is 9 after subtracting 105 from 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 36995.4
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
21 goes into 60 2 times with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 36995.42
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 9:
When dividing 180 by 21, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 36995.428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 10:
21 can be fit into 120 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 36995.4285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 11:
If we divide 150 by 21, we get 7 and a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 36995.42857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 12:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The next digit of our result is 1. 
Result so far: 36995.428571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 13:
When dividing 90 by 21, we get 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 36995.4285714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 14:
21 goes into 60 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 36995.42857142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final outcome is 36995.42857142, with a leftover of 1.8e-08.