644378 ÷ 73 
Our goal is to divide 644378 by 73.

On to step 1:
When dividing 6 by 73, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 73

Moving on to step 2:
The number 73 fits into 64 0 times, leaving a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Take the next digit (4) from the dividend and append it to 64, then repeat: 644 / 73

Moving on to step 3:
If we divide 644 by 73, we get 8 and a remainder of 60.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtracting 584 from 644 leaves us with 60.
Fetch the next digit (3) from the dividend, attach it to 60 and continue: 603 / 73

Let's proceed to step 4:
73 can be fit into 603 8 times, resulting in a remainder of 19.
Put 8 as the next digit of the answer. 
Result so far: 88.0
If we subtract 584 from 603, we get 19.
Bring next digit (7) of the dividend behind the 19 and repeat the process: 197 / 73

Going ahead to step 5:
73 goes into 197 2 times with a remainder of 51.
Write down 2 as next digit of the result. 
Result so far: 882.0
Subtract 146 from 197 to get 51.
Append the next digit (8) from the dividend to 51 and continue with: 518 / 73

Moving on to step 6:
When dividing 518 by 73, we get 7 with a remainder of 7.
Write down 7 as next digit of the result. 
Result so far: 8827.0
The remainder is 7 after subtracting 511 from 518.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
The number 73 fits into 70 0 times, leaving a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 8827.0
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 8:
The number 73 fits into 700 9 times, leaving a remainder of 43.
Put 9 as the next digit of the answer. 
Result so far: 8827.09
Subtracting 657 from 700 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 9:
73 can be fit into 430 5 times, resulting in a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 8827.095
Subtract 365 from 430 to get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 10:
73 goes into 650 8 times with a remainder of 66.
Put 8 as the next digit of the answer. 
Result so far: 8827.0958
The remainder is 66 after subtracting 584 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 11:
If we divide 660 by 73, we get 9 and a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 8827.09589
Subtract 657 from 660 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 12:
The number 73 fits into 30 0 times, leaving a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 8827.09589
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 13:
If we divide 300 by 73, we get 4 and a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 8827.0958904
If we take 292 away from 300, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 14:
The number 73 fits into 80 1 times, leaving a remainder of 7.
The next digit of our result is 1. 
Result so far: 8827.09589041
Subtract 73 from 80 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final result is 8827.09589041 with a remainder of 7e-09.