396143 ÷ 42 
We want to divide 396143 by 42.

On to step 1:
42 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 42

Moving on to step 2:
If we divide 39 by 42, we get 0 and a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Take the next digit (6) from the dividend and append it to 39, then repeat: 396 / 42

Going ahead to step 3:
42 can be fit into 396 9 times, resulting in a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtracting 378 from 396 leaves us with 18.
Grab the next digit (1) from the dividend, add it to 18, then carry on: 181 / 42

Going ahead to step 4:
42 goes into 181 4 times with a remainder of 13.
Record the quotient 4 as the next digit in the result. 
Result so far: 94.0
Subtracting 168 from 181 leaves us with 13.
Append the next digit (4) from the dividend to 13 and continue with: 134 / 42

Step 5:
If we divide 134 by 42, we get 3 and a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 943.0
If we take 126 away from 134, we end up with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 42

Advancing to step 6:
The number 42 fits into 83 1 times, leaving a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 9431.0
If we subtract 42 from 83, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 7:
When dividing 410 by 42, we get 9 with a remainder of 32.
Record the quotient 9 as the next digit in the result. 
Result so far: 9431.9
Deduct 378 from 410 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 8:
42 goes into 320 7 times with a remainder of 26.
The number 7 becomes the next digit in our result. 
Result so far: 9431.97
Subtract 294 from 320 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 9:
42 can be fit into 260 6 times, resulting in a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 9431.976
The remainder is 8 after subtracting 252 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
When dividing 80 by 42, we get 1 with a remainder of 38.
Use 1 as the next digit of our solution. 
Result so far: 9431.9761
The remainder is 38 after subtracting 42 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 11:
If we divide 380 by 42, we get 9 and a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 9431.97619
Subtract 378 from 380 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 12:
If we divide 20 by 42, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 9431.97619
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 13:
42 goes into 200 4 times with a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 9431.9761904
Subtracting 168 from 200 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 14:
If we divide 320 by 42, we get 7 and a remainder of 26.
Record the quotient 7 as the next digit in the result. 
Result so far: 9431.97619047
If we take 294 away from 320, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

After the division, we end up with 9431.97619047 and a remainder of 2.6e-08.