Let's divide 156621 by 42
We're looking to find how many times 42 goes into 156621.

Step 1:
1 divided by 42 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 42

Moving on to step 2:
If we divide 15 by 42, we get 0 and a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 42

Advancing to step 3:
42 can be fit into 156 3 times, resulting in a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 126 from 156, we get 30.
Append the next digit (6) from the dividend to 30 and continue with: 306 / 42

Let's proceed to step 4:
If we divide 306 by 42, we get 7 and a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 37.0
Subtract 294 from 306 to get 12.
Bring next digit (2) of the dividend behind the 12 and repeat the process: 122 / 42

Moving on to step 5:
The number 42 fits into 122 2 times, leaving a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 372.0
Subtract 84 from 122 to get 38.
Grab the next digit (1) from the dividend, add it to 38, then carry on: 381 / 42

Going ahead to step 6:
381 divided by 42 is 9 with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 3729.0
If we subtract 378 from 381, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
42 goes into 30 0 times with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 3729.0
Subtract 0 from 30 to 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 8:
The number 42 fits into 300 7 times, leaving a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 3729.07
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.

Advancing to step 9:
60 divided by 42 is 1 with a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 3729.071
Deduct 42 from 60 and we're left 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.

Moving on to step 10:
The number 42 fits into 180 4 times, leaving a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 3729.0714
Subtract 168 from 180 to 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.

Step 11:
If we divide 120 by 42, we get 2 and a remainder of 36.
The next digit of our result is 2. 
Result so far: 3729.07142
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.

Step 12:
When dividing 360 by 42, we get 8 with a remainder of 24.
Record the quotient 8 as the next digit in the result. 
Result so far: 3729.071428
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.

Moving on to step 13:
240 divided by 42 is 5 with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 3729.0714285
Deduct 210 from 240 and we're left 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.

Let's proceed to step 14:
42 goes into 300 7 times with a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 3729.07142857
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.

The final outcome is 3729.07142857, with a leftover of 6e-09.