We look at the division of 72101943 by 159 
We're looking to find how many times 159 goes into 72101943.

On to step 1:
7 divided by 159 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 159

Going ahead to step 2:
159 can be fit into 72 0 times, resulting in a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Take the next digit (1) from the dividend and append it to 72, then repeat: 721 / 159

Going ahead to step 3:
159 can be fit into 721 4 times, resulting in a remainder of 85.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 85 after subtracting 636 from 721.
Include the next digit (0) from the dividend after 85, then repeat: 850 / 159

Going ahead to step 4:
When dividing 850 by 159, we get 5 with a remainder of 55.
The next digit of our result is 5. 
Result so far: 45.0
If we subtract 795 from 850, we get 55.
Take the next digit (1) from the dividend and append it to 55, then repeat: 551 / 159

Step 5:
159 can be fit into 551 3 times, resulting in a remainder of 74.
Use 3 as the next digit of our solution. 
Result so far: 453.0
Subtracting 477 from 551 leaves us with 74.
Bring next digit (9) of the dividend behind the 74 and repeat the process: 749 / 159

Going ahead to step 6:
749 divided by 159 is 4 with a remainder of 113.
The next digit of our result is 4. 
Result so far: 4534.0
Subtract 636 from 749 to get 113.
Take the next digit (4) from the dividend and append it to 113, then repeat: 1134 / 159

Going ahead to step 7:
159 goes into 1134 7 times with a remainder of 21.
Write down 7 as next digit of the result. 
Result so far: 45347.0
If we take 1113 away from 1134, we end up with 21.
Take the next digit (3) from the dividend and append it to 21, then repeat: 213 / 159

Let's proceed to step 8:
213 divided by 159 is 1 with a remainder of 54.
Record the quotient 1 as the next digit in the result. 
Result so far: 453471.0
If we subtract 159 from 213, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 9:
The number 159 fits into 540 3 times, leaving a remainder of 63.
Use 3 as the next digit of our solution. 
Result so far: 453471.3
Subtracting 477 from 540 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 10:
159 can be fit into 630 3 times, resulting in a remainder of 153.
Put 3 as the next digit of the answer. 
Result so far: 453471.33
Deduct 477 from 630 and we're left with 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

The final outcome is 453471.33, with a leftover of 0.153.