665939 divided by 42 
Our goal is to divide 665939 by 42.

Let's proceed to step 1:
If we divide 6 by 42, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 42

Step 2:
42 can be fit into 66 1 times, resulting in a remainder of 24.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 42 away from 66, we end up with 24.
Fetch the next digit (5) from the dividend, attach it to 24 and continue: 245 / 42

Moving on to step 3:
42 can be fit into 245 5 times, resulting in a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtracting 210 from 245 leaves us with 35.
Bring next digit (9) of the dividend behind the 35 and repeat the process: 359 / 42

Going ahead to step 4:
The number 42 fits into 359 8 times, leaving a remainder of 23.
The next digit of our result is 8. 
Result so far: 158.0
If we take 336 away from 359, we end up with 23.
Take the next digit (3) from the dividend and append it to 23, then repeat: 233 / 42

Advancing to step 5:
42 can be fit into 233 5 times, resulting in a remainder of 23.
The next digit of our result is 5. 
Result so far: 1585.0
Subtracting 210 from 233 leaves us with 23.
Take the next digit (9) from the dividend and append it to 23, then repeat: 239 / 42

Going ahead to step 6:
42 can be fit into 239 5 times, resulting in a remainder of 29.
The number 5 becomes the next digit in our result. 
Result so far: 15855.0
Deduct 210 from 239 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.

Step 7:
The number 42 fits into 290 6 times, leaving a remainder of 38.
The number 6 becomes the next digit in our result. 
Result so far: 15855.6
If we take 252 away from 290, we end up 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.

Moving on to step 8:
The number 42 fits into 380 9 times, leaving a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 15855.69
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.

Going ahead to step 9:
42 can be fit into 20 0 times, resulting in a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 15855.69
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.

Moving on to step 10:
42 can be fit into 200 4 times, resulting in a remainder of 32.
Record the quotient 4 as the next digit in the result. 
Result so far: 15855.6904
The remainder is 32 after subtracting 168 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 11:
42 goes into 320 7 times with a remainder of 26.
The number 7 becomes the next digit in our result. 
Result so far: 15855.69047
Deduct 294 from 320 and we're left 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.

Moving on to step 12:
If we divide 260 by 42, we get 6 and a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 15855.690476
Subtract 252 from 260 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 13:
If we divide 80 by 42, we get 1 and a remainder of 38.
Put 1 as the next digit of the answer. 
Result so far: 15855.6904761
Deduct 42 from 80 and we're left 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 14:
42 can be fit into 380 9 times, resulting in a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 15855.69047619
If we take 378 away from 380, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 15855.69047619 with a remaining 2e-09.