We look at the division of 399668 by 87 
We're looking to find how many times 87 goes into 399668.

Step 1:
The number 87 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 87

Going ahead to step 2:
When dividing 39 by 87, we get 0 with a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Bring next digit (9) of the dividend behind the 39 and repeat the process: 399 / 87

On to step 3:
If we divide 399 by 87, we get 4 and a remainder of 51.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 348 from 399 leaves us with 51.
Bring next digit (6) of the dividend behind the 51 and repeat the process: 516 / 87

Advancing to step 4:
When dividing 516 by 87, we get 5 with a remainder of 81.
Put 5 as the next digit of the answer. 
Result so far: 45.0
Subtract 435 from 516 to get 81.
Append the next digit (6) from the dividend to 81 and continue with: 816 / 87

Step 5:
When dividing 816 by 87, we get 9 with a remainder of 33.
The number 9 becomes the next digit in our result. 
Result so far: 459.0
Subtracting 783 from 816 leaves us with 33.
Append the next digit (8) from the dividend to 33 and continue with: 338 / 87

Going ahead to step 6:
87 can be fit into 338 3 times, resulting in a remainder of 77.
Put 3 as the next digit of the answer. 
Result so far: 4593.0
If we take 261 away from 338, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Step 7:
87 goes into 770 8 times with a remainder of 74.
Write down 8 as next digit of the result. 
Result so far: 4593.8
The remainder is 74 after subtracting 696 from 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 8:
The number 87 fits into 740 8 times, leaving a remainder of 44.
Put 8 as the next digit of the answer. 
Result so far: 4593.88
If we take 696 away from 740, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Our division results in 4593.88 with a remaining 0.044.