We're dividing 123549 by 42 
We're looking to find how many times 42 goes into 123549.

Step 1:
42 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 42

On to step 2:
The number 42 fits into 12 0 times, leaving a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 42

Advancing to step 3:
42 goes into 123 2 times with a remainder of 39.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 84 from 123 leaves us with 39.
Bring next digit (5) of the dividend behind the 39 and repeat the process: 395 / 42

Let's proceed to step 4:
The number 42 fits into 395 9 times, leaving a remainder of 17.
The next digit of our result is 9. 
Result so far: 29.0
Subtract 378 from 395 to get 17.
Append the next digit (4) from the dividend to 17 and continue with: 174 / 42

Moving on to step 5:
When dividing 174 by 42, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 294.0
Subtract 168 from 174 to get 6.
Fetch the next digit (9) from the dividend, attach it to 6 and continue: 69 / 42

Advancing to step 6:
42 goes into 69 1 times with a remainder of 27.
The next digit of our result is 1. 
Result so far: 2941.0
If we take 42 away from 69, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 7:
270 divided by 42 is 6 with a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 2941.6
If we subtract 252 from 270, we 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.

Step 8:
42 can be fit into 180 4 times, resulting in a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 2941.64
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
The number 42 fits into 120 2 times, leaving a remainder of 36.
Put 2 as the next digit of the answer. 
Result so far: 2941.642
Subtract 84 from 120 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 10:
When dividing 360 by 42, we get 8 with a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 2941.6428
If we subtract 336 from 360, we 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.

Moving on to step 11:
42 goes into 240 5 times with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 2941.64285
If we subtract 210 from 240, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 12:
42 can be fit into 300 7 times, resulting in a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 2941.642857
If we take 294 away from 300, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 13:
42 can be fit into 60 1 times, resulting in a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 2941.6428571
The remainder is 18 after subtracting 42 from 60.
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 14:
When dividing 180 by 42, we get 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 2941.64285714
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 2941.64285714 and a remainder of 1.2e-08.