We're dividing 212370 by 72 
We want to figure out the number of times 212370 can be divided by 72.

On to step 1:
2 divided by 72 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 72

Advancing to step 2:
The number 72 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (2) from the dividend, add it to 21, then carry on: 212 / 72

On to step 3:
212 divided by 72 is 2 with a remainder of 68.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 144 from 212 and we're left with 68.
Fetch the next digit (3) from the dividend, attach it to 68 and continue: 683 / 72

On to step 4:
683 divided by 72 is 9 with a remainder of 35.
The next digit of our result is 9. 
Result so far: 29.0
Subtract 648 from 683 to get 35.
Include the next digit (7) from the dividend after 35, then repeat: 357 / 72

On to step 5:
357 divided by 72 is 4 with a remainder of 69.
The number 4 becomes the next digit in our result. 
Result so far: 294.0
Deduct 288 from 357 and we're left with 69.
Grab the next digit (0) from the dividend, add it to 69, then carry on: 690 / 72

Moving on to step 6:
690 divided by 72 is 9 with a remainder of 42.
Put 9 as the next digit of the answer. 
Result so far: 2949.0
The remainder is 42 after subtracting 648 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 7:
72 can be fit into 420 5 times, resulting in a remainder of 60.
Record the quotient 5 as the next digit in the result. 
Result so far: 2949.5
If we take 360 away from 420, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 8:
600 divided by 72 is 8 with a remainder of 24.
Use 8 as the next digit of our solution. 
Result so far: 2949.58
The remainder is 24 after subtracting 576 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 9:
72 goes into 240 3 times with a remainder of 24.
Put 3 as the next digit of the answer. 
Result so far: 2949.583
Subtract 216 from 240 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 10:
When dividing 240 by 72, we get 3 with a remainder of 24.
The next digit of our result is 3. 
Result so far: 2949.5833
Subtracting 216 from 240 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 2949.5833 with a remainder of 0.00024.