We look at the division of 40563090 by 399 
We want to figure out the number of times 40563090 can be divided by 399.

Step 1:
The number 399 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 399

Moving on to step 2:
399 goes into 40 0 times with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 40, we end up with 40.
Append the next digit (5) from the dividend to 40 and continue with: 405 / 399

Step 3:
The number 399 fits into 405 1 times, leaving a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 399 from 405 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 399

Let's proceed to step 4:
The number 399 fits into 66 0 times, leaving a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtract 0 from 66 to get 66.
Take the next digit (3) from the dividend and append it to 66, then repeat: 663 / 399

Moving on to step 5:
When dividing 663 by 399, we get 1 with a remainder of 264.
Put 1 as the next digit of the answer. 
Result so far: 101.0
If we take 399 away from 663, we end up with 264.
Append the next digit (0) from the dividend to 264 and continue with: 2640 / 399

Advancing to step 6:
If we divide 2640 by 399, we get 6 and a remainder of 246.
Record the quotient 6 as the next digit in the result. 
Result so far: 1016.0
Subtract 2394 from 2640 to get 246.
Bring next digit (9) of the dividend behind the 246 and repeat the process: 2469 / 399

Moving on to step 7:
When dividing 2469 by 399, we get 6 with a remainder of 75.
The number 6 becomes the next digit in our result. 
Result so far: 10166.0
Deduct 2394 from 2469 and we're left with 75.
Bring next digit (0) of the dividend behind the 75 and repeat the process: 750 / 399

On to step 8:
399 can be fit into 750 1 times, resulting in a remainder of 351.
The next digit of our result is 1. 
Result so far: 101661.0
Subtracting 399 from 750 leaves us with 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Advancing to step 9:
3510 divided by 399 is 8 with a remainder of 318.
The next digit of our result is 8. 
Result so far: 101661.8
The remainder is 318 after subtracting 3192 from 3510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Step 10:
The number 399 fits into 3180 7 times, leaving a remainder of 387.
Put 7 as the next digit of the answer. 
Result so far: 101661.87
If we subtract 2793 from 3180, we get 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Advancing to step 11:
399 can be fit into 3870 9 times, resulting in a remainder of 279.
Write down 9 as next digit of the result. 
Result so far: 101661.879
If we subtract 3591 from 3870, we get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Step 12:
When dividing 2790 by 399, we get 6 with a remainder of 396.
The next digit of our result is 6. 
Result so far: 101661.8796
If we subtract 2394 from 2790, we get 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

Going ahead to step 13:
399 can be fit into 3960 9 times, resulting in a remainder of 369.
Record the quotient 9 as the next digit in the result. 
Result so far: 101661.87969
Subtract 3591 from 3960 to get 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Step 14:
When dividing 3690 by 399, we get 9 with a remainder of 99.
Record the quotient 9 as the next digit in the result. 
Result so far: 101661.879699
The remainder is 99 after subtracting 3591 from 3690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

The final outcome is 101661.879699, with a leftover of 9.9e-06.