We're dividing 124239 by 72 
We want to figure out the number of times 124239 can be divided by 72.

Step 1:
1 divided by 72 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 72

On to step 2:
72 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (4) from the dividend, attach it to 12 and continue: 124 / 72

Moving on to step 3:
When dividing 124 by 72, we get 1 with a remainder of 52.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 72 from 124, we get 52.
Include the next digit (2) from the dividend after 52, then repeat: 522 / 72

On to step 4:
When dividing 522 by 72, we get 7 with a remainder of 18.
The next digit of our result is 7. 
Result so far: 17.0
If we subtract 504 from 522, we get 18.
Take the next digit (3) from the dividend and append it to 18, then repeat: 183 / 72

Advancing to step 5:
72 goes into 183 2 times with a remainder of 39.
Put 2 as the next digit of the answer. 
Result so far: 172.0
If we take 144 away from 183, we end up with 39.
Append the next digit (9) from the dividend to 39 and continue with: 399 / 72

Going ahead to step 6:
The number 72 fits into 399 5 times, leaving a remainder of 39.
Use 5 as the next digit of our solution. 
Result so far: 1725.0
Subtract 360 from 399 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 7:
When dividing 390 by 72, we get 5 with a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 1725.5
Subtract 360 from 390 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.

Step 8:
72 can be fit into 300 4 times, resulting in a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 1725.54
Subtracting 288 from 300 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 9:
72 goes into 120 1 times with a remainder of 48.
The next digit of our result is 1. 
Result so far: 1725.541
The remainder is 48 after subtracting 72 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 10:
480 divided by 72 is 6 with a remainder of 48.
Put 6 as the next digit of the answer. 
Result so far: 1725.5416
Subtract 432 from 480 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 11:
The number 72 fits into 480 6 times, leaving a remainder of 48.
Put 6 as the next digit of the answer. 
Result so far: 1725.54166
Deduct 432 from 480 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Our division results in 1725.54166 with a remaining 4.8e-05.