393704 ÷ 87 
Our goal is to divide 393704 by 87.

On to step 1:
If we divide 3 by 87, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 87

Going ahead to step 2:
87 can be fit into 39 0 times, resulting in a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Include the next digit (3) from the dividend after 39, then repeat: 393 / 87

Going ahead to step 3:
If we divide 393 by 87, we get 4 and a remainder of 45.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 348 from 393 and we're left with 45.
Take the next digit (7) from the dividend and append it to 45, then repeat: 457 / 87

Going ahead to step 4:
87 goes into 457 5 times with a remainder of 22.
Write down 5 as next digit of the result. 
Result so far: 45.0
If we take 435 away from 457, we end up with 22.
Bring next digit (0) of the dividend behind the 22 and repeat the process: 220 / 87

Step 5:
87 can be fit into 220 2 times, resulting in a remainder of 46.
Put 2 as the next digit of the answer. 
Result so far: 452.0
If we take 174 away from 220, we end up with 46.
Fetch the next digit (4) from the dividend, attach it to 46 and continue: 464 / 87

Advancing to step 6:
87 goes into 464 5 times with a remainder of 29.
Record the quotient 5 as the next digit in the result. 
Result so far: 4525.0
The remainder is 29 after subtracting 435 from 464.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 7:
The number 87 fits into 290 3 times, leaving a remainder of 29.
Write down 3 as next digit of the result. 
Result so far: 4525.3
Subtracting 261 from 290 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 8:
If we divide 290 by 87, we get 3 and a remainder of 29.
The number 3 becomes the next digit in our result. 
Result so far: 4525.33
Subtract 261 from 290 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

After the division, we end up with 4525.33 and a remainder of 0.029.