We look at the division of 343631 by 42 
We're looking to find how many times 42 goes into 343631.

On to step 1:
When dividing 3 by 42, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 42

Advancing to step 2:
The number 42 fits into 34 0 times, leaving a remainder of 34.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 34 and we're left with 34.
Grab the next digit (3) from the dividend, add it to 34, then carry on: 343 / 42

Moving on to step 3:
42 can be fit into 343 8 times, resulting in a remainder of 7.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 336 from 343, we get 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 42

Step 4:
76 divided by 42 is 1 with a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 81.0
If we take 42 away from 76, we end up with 34.
Fetch the next digit (3) from the dividend, attach it to 34 and continue: 343 / 42

Going ahead to step 5:
42 can be fit into 343 8 times, resulting in a remainder of 7.
Put 8 as the next digit of the answer. 
Result so far: 818.0
If we take 336 away from 343, we end up with 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 42

On to step 6:
The number 42 fits into 71 1 times, leaving a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 8181.0
Deduct 42 from 71 and we're left 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.

Going ahead to step 7:
The number 42 fits into 290 6 times, leaving a remainder of 38.
The next digit of our result is 6. 
Result so far: 8181.6
Subtracting 252 from 290 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 8:
The number 42 fits into 380 9 times, leaving a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 8181.69
If we subtract 378 from 380, we 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.

Moving on to step 9:
42 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 8181.69
If we subtract 0 from 20, we 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.

On to step 10:
The number 42 fits into 200 4 times, leaving a remainder of 32.
Record the quotient 4 as the next digit in the result. 
Result so far: 8181.6904
If we take 168 away from 200, we end up 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 11:
42 can be fit into 320 7 times, resulting in a remainder of 26.
The next digit of our result is 7. 
Result so far: 8181.69047
The remainder is 26 after subtracting 294 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 12:
42 can be fit into 260 6 times, resulting in a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 8181.690476
Deduct 252 from 260 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 13:
If we divide 80 by 42, we get 1 and a remainder of 38.
Write down 1 as next digit of the result. 
Result so far: 8181.6904761
If we subtract 42 from 80, we get 38.
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 14:
If we divide 380 by 42, we get 9 and a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 8181.69047619
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.

In conclusion, the division gives 8181.69047619 with a balance of 2e-09.