39905866 ÷ 763 
We want to figure out the number of times 39905866 can be divided by 763.

Going ahead to step 1:
763 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 763

Advancing to step 2:
The number 763 fits into 39 0 times, leaving a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Fetch the next digit (9) from the dividend, attach it to 39 and continue: 399 / 763

Going ahead to step 3:
763 can be fit into 399 0 times, resulting in a remainder of 399.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 399 and we're left with 399.
Fetch the next digit (0) from the dividend, attach it to 399 and continue: 3990 / 763

On to step 4:
3990 divided by 763 is 5 with a remainder of 175.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 175 after subtracting 3815 from 3990.
Take the next digit (5) from the dividend and append it to 175, then repeat: 1755 / 763

Let's proceed to step 5:
1755 divided by 763 is 2 with a remainder of 229.
Record the quotient 2 as the next digit in the result. 
Result so far: 52.0
If we take 1526 away from 1755, we end up with 229.
Append the next digit (8) from the dividend to 229 and continue with: 2298 / 763

Step 6:
763 goes into 2298 3 times with a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 523.0
Deduct 2289 from 2298 and we're left with 9.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 763

Step 7:
763 can be fit into 96 0 times, resulting in a remainder of 96.
Put 0 as the next digit of the answer. 
Result so far: 5230.0
If we subtract 0 from 96, we get 96.
Append the next digit (6) from the dividend to 96 and continue with: 966 / 763

Advancing to step 8:
763 can be fit into 966 1 times, resulting in a remainder of 203.
Write down 1 as next digit of the result. 
Result so far: 52301.0
Subtracting 763 from 966 leaves us with 203.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2030, and continue the process.

Step 9:
The number 763 fits into 2030 2 times, leaving a remainder of 504.
The number 2 becomes the next digit in our result. 
Result so far: 52301.2
If we take 1526 away from 2030, we end up with 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

Going ahead to step 10:
If we divide 5040 by 763, we get 6 and a remainder of 462.
Use 6 as the next digit of our solution. 
Result so far: 52301.26
Deduct 4578 from 5040 and we're left with 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

On to step 11:
4620 divided by 763 is 6 with a remainder of 42.
Put 6 as the next digit of the answer. 
Result so far: 52301.266
If we subtract 4578 from 4620, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The final result is 52301.266 with a remainder of 0.0042.