120901 ÷ 20 
We're looking to find how many times 20 goes into 120901.

Step 1:
The number 20 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 20

Moving on to step 2:
The number 20 fits into 12 0 times, leaving a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (0) from the dividend, add it to 12, then carry on: 120 / 20

Advancing to step 3:
20 goes into 120 6 times with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtracting 120 from 120 leaves us with 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 20

Advancing to step 4:
When dividing 9 by 20, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 60.0
If we take 0 away from 9, we end up with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 20

Moving on to step 5:
If we divide 90 by 20, we get 4 and a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 604.0
If we subtract 80 from 90, we get 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 20

Going ahead to step 6:
20 goes into 101 5 times with a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 6045.0
If we subtract 100 from 101, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
20 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 6045.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
When dividing 100 by 20, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 6045.05
Subtract 100 from 100 to 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.

Step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 6045.05
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.

Let's proceed to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 6045.05
Subtracting 0 from 0 leaves us with 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 6045.05 with a remaining 0.0.