42954213 divided by 399 
Our goal is to divide 42954213 by 399.

Going ahead to step 1:
If we divide 4 by 399, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 399

Going ahead to step 2:
399 can be fit into 42 0 times, resulting in a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Bring next digit (9) of the dividend behind the 42 and repeat the process: 429 / 399

On to step 3:
399 can be fit into 429 1 times, resulting in a remainder of 30.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 399 from 429 leaves us with 30.
Bring next digit (5) of the dividend behind the 30 and repeat the process: 305 / 399

Let's proceed to step 4:
When dividing 305 by 399, we get 0 with a remainder of 305.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 305 leaves us with 305.
Fetch the next digit (4) from the dividend, attach it to 305 and continue: 3054 / 399

Advancing to step 5:
399 goes into 3054 7 times with a remainder of 261.
Record the quotient 7 as the next digit in the result. 
Result so far: 107.0
Subtract 2793 from 3054 to get 261.
Bring next digit (2) of the dividend behind the 261 and repeat the process: 2612 / 399

Moving on to step 6:
When dividing 2612 by 399, we get 6 with a remainder of 218.
The number 6 becomes the next digit in our result. 
Result so far: 1076.0
If we take 2394 away from 2612, we end up with 218.
Include the next digit (1) from the dividend after 218, then repeat: 2181 / 399

Let's proceed to step 7:
399 goes into 2181 5 times with a remainder of 186.
Use 5 as the next digit of our solution. 
Result so far: 10765.0
Subtract 1995 from 2181 to get 186.
Fetch the next digit (3) from the dividend, attach it to 186 and continue: 1863 / 399

Moving on to step 8:
1863 divided by 399 is 4 with a remainder of 267.
The next digit of our result is 4. 
Result so far: 107654.0
Subtract 1596 from 1863 to get 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Going ahead to step 9:
The number 399 fits into 2670 6 times, leaving a remainder of 276.
Write down 6 as next digit of the result. 
Result so far: 107654.6
Deduct 2394 from 2670 and we're left with 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Step 10:
If we divide 2760 by 399, we get 6 and a remainder of 366.
Write down 6 as next digit of the result. 
Result so far: 107654.66
If we take 2394 away from 2760, we end up with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

After the division, we end up with 107654.66 and a remainder of 0.366.