We're dividing 766416 by 21 
We want to divide 766416 by 21.

Moving on to step 1:
21 can be fit into 7 0 times, resulting in a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (6) from the dividend after 7, then repeat: 76 / 21

Let's proceed to step 2:
If we divide 76 by 21, we get 3 and a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 63 from 76 leaves us with 13.
Fetch the next digit (6) from the dividend, attach it to 13 and continue: 136 / 21

On to step 3:
The number 21 fits into 136 6 times, leaving a remainder of 10.
The next digit of our result is 6. 
Result so far: 36.0
If we subtract 126 from 136, we get 10.
Fetch the next digit (4) from the dividend, attach it to 10 and continue: 104 / 21

Moving on to step 4:
When dividing 104 by 21, we get 4 with a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 364.0
If we take 84 away from 104, we end up with 20.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 21

Moving on to step 5:
21 can be fit into 201 9 times, resulting in a remainder of 12.
The next digit of our result is 9. 
Result so far: 3649.0
Subtract 189 from 201 to get 12.
Grab the next digit (6) from the dividend, add it to 12, then carry on: 126 / 21

Step 6:
21 goes into 126 6 times with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 36496.0
Subtract 126 from 126 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
When dividing 0 by 21, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 36496.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
0 divided by 21 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 36496.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 36496.0, with a leftover of 0.0.