We divide 156555 by 21
We're looking to find how many times 21 goes into 156555.

Going ahead to step 1:
When dividing 1 by 21, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 21

Going ahead to step 2:
The number 21 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Take the next digit (6) from the dividend and append it to 15, then repeat: 156 / 21

Advancing to step 3:
156 divided by 21 is 7 with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 147 away from 156, we end up with 9.
Append the next digit (5) from the dividend to 9 and continue with: 95 / 21

Moving on to step 4:
21 can be fit into 95 4 times, resulting in a remainder of 11.
Record the quotient 4 as the next digit in the result. 
Result so far: 74.0
Subtract 84 from 95 to get 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 21

Moving on to step 5:
21 goes into 115 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 745.0
Deduct 105 from 115 and we're left with 10.
Bring next digit (5) of the dividend behind the 10 and repeat the process: 105 / 21

Step 6:
21 goes into 105 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 7455.0
The remainder is 0 after subtracting 105 from 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
When dividing 0 by 21, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 7455.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
21 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 7455.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 7455.0 with a remaining 0.0.