Let's divide 126549 by 42
Our goal is to divide 126549 by 42.

Going ahead to step 1:
If we divide 1 by 42, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 42

On to step 2:
When dividing 12 by 42, we get 0 with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Grab the next digit (6) from the dividend, add it to 12, then carry on: 126 / 42

On to step 3:
126 divided by 42 is 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 126 away from 126, we end up with 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 42

Advancing to step 4:
5 divided by 42 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
If we subtract 0 from 5, we get 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 42

Going ahead to step 5:
42 goes into 54 1 times with a remainder of 12.
The next digit of our result is 1. 
Result so far: 301.0
Subtracting 42 from 54 leaves us with 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 42

Going ahead to step 6:
The number 42 fits into 129 3 times, leaving a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 3013.0
Subtracting 126 from 129 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
42 goes into 30 0 times with a remainder of 30.
The next digit of our result is 0. 
Result so far: 3013.0
Subtracting 0 from 30 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.

Advancing to step 8:
42 can be fit into 300 7 times, resulting in a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 3013.07
If we subtract 294 from 300, we 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.

Advancing to step 9:
If we divide 60 by 42, we get 1 and a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 3013.071
Subtracting 42 from 60 leaves us 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.

Step 10:
180 divided by 42 is 4 with a remainder of 12.
Use 4 as the next digit of our solution. 
Result so far: 3013.0714
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.

Going ahead to step 11:
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: 3013.07142
Deduct 84 from 120 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 12:
360 divided by 42 is 8 with a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 3013.071428
Subtracting 336 from 360 leaves us with 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 13:
When dividing 240 by 42, we get 5 with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 3013.0714285
If we take 210 away from 240, 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.

Going ahead to step 14:
300 divided by 42 is 7 with a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 3013.07142857
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.

The final outcome is 3013.07142857, with a leftover of 6e-09.