We're dividing 72079869 by 645 
We're looking to find how many times 645 goes into 72079869.

On to step 1:
The number 645 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 645

Going ahead to step 2:
The number 645 fits into 72 0 times, leaving 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.
Grab the next digit (0) from the dividend, add it to 72, then carry on: 720 / 645

Going ahead to step 3:
If we divide 720 by 645, we get 1 and a remainder of 75.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 645 away from 720, we end up with 75.
Include the next digit (7) from the dividend after 75, then repeat: 757 / 645

Let's proceed to step 4:
If we divide 757 by 645, we get 1 and a remainder of 112.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtract 645 from 757 to get 112.
Grab the next digit (9) from the dividend, add it to 112, then carry on: 1129 / 645

Advancing to step 5:
When dividing 1129 by 645, we get 1 with a remainder of 484.
The next digit of our result is 1. 
Result so far: 111.0
Subtracting 645 from 1129 leaves us with 484.
Include the next digit (8) from the dividend after 484, then repeat: 4848 / 645

Moving on to step 6:
When dividing 4848 by 645, we get 7 with a remainder of 333.
Write down 7 as next digit of the result. 
Result so far: 1117.0
If we subtract 4515 from 4848, we get 333.
Bring next digit (6) of the dividend behind the 333 and repeat the process: 3336 / 645

Let's proceed to step 7:
645 can be fit into 3336 5 times, resulting in a remainder of 111.
Use 5 as the next digit of our solution. 
Result so far: 11175.0
If we take 3225 away from 3336, we end up with 111.
Grab the next digit (9) from the dividend, add it to 111, then carry on: 1119 / 645

Let's proceed to step 8:
The number 645 fits into 1119 1 times, leaving a remainder of 474.
The number 1 becomes the next digit in our result. 
Result so far: 111751.0
The remainder is 474 after subtracting 645 from 1119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

Let's proceed to step 9:
4740 divided by 645 is 7 with a remainder of 225.
Record the quotient 7 as the next digit in the result. 
Result so far: 111751.7
If we subtract 4515 from 4740, we get 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Let's proceed to step 10:
If we divide 2250 by 645, we get 3 and a remainder of 315.
The number 3 becomes the next digit in our result. 
Result so far: 111751.73
If we subtract 1935 from 2250, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Step 11:
3150 divided by 645 is 4 with a remainder of 570.
Use 4 as the next digit of our solution. 
Result so far: 111751.734
Subtracting 2580 from 3150 leaves us with 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5700, and continue the process.

Step 12:
645 can be fit into 5700 8 times, resulting in a remainder of 540.
Put 8 as the next digit of the answer. 
Result so far: 111751.7348
Deduct 5160 from 5700 and we're left with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

On to step 13:
When dividing 5400 by 645, we get 8 with a remainder of 240.
Put 8 as the next digit of the answer. 
Result so far: 111751.73488
The remainder is 240 after subtracting 5160 from 5400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The quotient of the division is 111751.73488, and the remainder is 0.00024.