We're dividing 6390 by 72 
We're looking to find how many times 72 goes into 6390.

Advancing to step 1:
If we divide 6 by 72, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 72

On to step 2:
72 can be fit into 63 0 times, resulting in a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Take the next digit (9) from the dividend and append it to 63, then repeat: 639 / 72

Advancing to step 3:
If we divide 639 by 72, we get 8 and a remainder of 63.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtract 576 from 639 to get 63.
Grab the next digit (0) from the dividend, add it to 63, then carry on: 630 / 72

Going ahead to step 4:
The number 72 fits into 630 8 times, leaving a remainder of 54.
Record the quotient 8 as the next digit in the result. 
Result so far: 88.0
Deduct 576 from 630 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 5:
72 can be fit into 540 7 times, resulting in a remainder of 36.
Put 7 as the next digit of the answer. 
Result so far: 88.7
Subtract 504 from 540 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 6:
If we divide 360 by 72, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 88.75
If we take 360 away from 360, we end up 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.

Step 7:
72 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 88.75
If we subtract 0 from 0, we 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.

Going ahead to step 8:
When dividing 0 by 72, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 88.75
If we subtract 0 from 0, we 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.

The final outcome is 88.75, with a leftover of 0.0.