4387942 ÷ 999 
Let's see how many times 999 fits into 4387942.

On to step 1:
When dividing 4 by 999, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 999

Advancing to step 2:
999 goes into 43 0 times with a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Fetch the next digit (8) from the dividend, attach it to 43 and continue: 438 / 999

Let's proceed to step 3:
If we divide 438 by 999, we get 0 and a remainder of 438.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 438 leaves us with 438.
Grab the next digit (7) from the dividend, add it to 438, then carry on: 4387 / 999

Advancing to step 4:
When dividing 4387 by 999, we get 4 with a remainder of 391.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 3996 from 4387 and we're left with 391.
Append the next digit (9) from the dividend to 391 and continue with: 3919 / 999

Advancing to step 5:
When dividing 3919 by 999, we get 3 with a remainder of 922.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
If we subtract 2997 from 3919, we get 922.
Include the next digit (4) from the dividend after 922, then repeat: 9224 / 999

Let's proceed to step 6:
9224 divided by 999 is 9 with a remainder of 233.
Record the quotient 9 as the next digit in the result. 
Result so far: 439.0
If we take 8991 away from 9224, we end up with 233.
Take the next digit (2) from the dividend and append it to 233, then repeat: 2332 / 999

Going ahead to step 7:
If we divide 2332 by 999, we get 2 and a remainder of 334.
The number 2 becomes the next digit in our result. 
Result so far: 4392.0
If we take 1998 away from 2332, we end up with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Advancing to step 8:
999 goes into 3340 3 times with a remainder of 343.
Record the quotient 3 as the next digit in the result. 
Result so far: 4392.3
Subtract 2997 from 3340 to get 343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3430, and continue the process.

Step 9:
If we divide 3430 by 999, we get 3 and a remainder of 433.
Put 3 as the next digit of the answer. 
Result so far: 4392.33
Deduct 2997 from 3430 and we're left with 433.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4330, and continue the process.

After the division, we end up with 4392.33 and a remainder of 0.433.