346866 ÷ 42 
Let's see how many times 42 fits into 346866.

Going ahead 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.
Grab the next digit (4) from the dividend, add it to 3, then carry on: 34 / 42

Going ahead to step 2:
If we divide 34 by 42, we get 0 and a remainder of 34.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 34, we end up with 34.
Append the next digit (6) from the dividend to 34 and continue with: 346 / 42

Advancing to step 3:
The number 42 fits into 346 8 times, leaving a remainder of 10.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 336 from 346 leaves us with 10.
Fetch the next digit (8) from the dividend, attach it to 10 and continue: 108 / 42

Advancing to step 4:
42 goes into 108 2 times with a remainder of 24.
The next digit of our result is 2. 
Result so far: 82.0
Subtract 84 from 108 to get 24.
Grab the next digit (6) from the dividend, add it to 24, then carry on: 246 / 42

Step 5:
If we divide 246 by 42, we get 5 and a remainder of 36.
Use 5 as the next digit of our solution. 
Result so far: 825.0
Subtract 210 from 246 to get 36.
Bring next digit (6) of the dividend behind the 36 and repeat the process: 366 / 42

Going ahead to step 6:
366 divided by 42 is 8 with a remainder of 30.
Put 8 as the next digit of the answer. 
Result so far: 8258.0
If we take 336 away from 366, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 7:
300 divided by 42 is 7 with a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 8258.7
Subtract 294 from 300 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
42 can be fit into 60 1 times, resulting in a remainder of 18.
The next digit of our result is 1. 
Result so far: 8258.71
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 9:
180 divided by 42 is 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 8258.714
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 10:
42 can be fit into 120 2 times, resulting in a remainder of 36.
The next digit of our result is 2. 
Result so far: 8258.7142
The remainder is 36 after subtracting 84 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 11:
If we divide 360 by 42, we get 8 and a remainder of 24.
Use 8 as the next digit of our solution. 
Result so far: 8258.71428
Subtract 336 from 360 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 12:
When dividing 240 by 42, we get 5 with a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 8258.714285
Subtracting 210 from 240 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 13:
If we divide 300 by 42, we get 7 and a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 8258.7142857
The remainder is 6 after subtracting 294 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
The number 42 fits into 60 1 times, leaving a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 8258.71428571
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final outcome is 8258.71428571, with a leftover of 1.8e-08.