159923 ÷ 42 
We want to figure out the number of times 159923 can be divided by 42.

Going ahead to 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.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 42

Advancing to step 2:
If we divide 15 by 42, we get 0 and a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 42

Step 3:
When dividing 159 by 42, we get 3 with a remainder of 33.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 126 from 159 and we're left with 33.
Fetch the next digit (9) from the dividend, attach it to 33 and continue: 339 / 42

Going ahead to step 4:
The number 42 fits into 339 8 times, leaving a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 38.0
The remainder is 3 after subtracting 336 from 339.
Grab the next digit (2) from the dividend, add it to 3, then carry on: 32 / 42

Moving on to step 5:
42 can be fit into 32 0 times, resulting in a remainder of 32.
Put 0 as the next digit of the answer. 
Result so far: 380.0
The remainder is 32 after subtracting 0 from 32.
Include the next digit (3) from the dividend after 32, then repeat: 323 / 42

On to step 6:
42 goes into 323 7 times with a remainder of 29.
Write down 7 as next digit of the result. 
Result so far: 3807.0
If we take 294 away from 323, we end up 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.

Let's proceed to step 7:
If we divide 290 by 42, we get 6 and a remainder of 38.
Write down 6 as next digit of the result. 
Result so far: 3807.6
If we subtract 252 from 290, 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.

Advancing to step 8:
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: 3807.69
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.

Let's proceed to step 9:
When dividing 20 by 42, we get 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 3807.69
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 10:
The number 42 fits into 200 4 times, leaving a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 3807.6904
Subtract 168 from 200 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On 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: 3807.69047
If we take 294 away from 320, we end up 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:
42 can be fit into 260 6 times, resulting in a remainder of 8.
The next digit of our result is 6. 
Result so far: 3807.690476
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.

On to step 13:
42 can be fit into 80 1 times, resulting in a remainder of 38.
Use 1 as the next digit of our solution. 
Result so far: 3807.6904761
If we take 42 away from 80, 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.

Going ahead to step 14:
42 goes into 380 9 times with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 3807.69047619
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.

The final outcome is 3807.69047619, with a leftover of 2e-09.