Let's divide 643890 by 63
We want to divide 643890 by 63.

Step 1:
The number 63 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 63

Let's proceed to step 2:
The number 63 fits into 64 1 times, leaving a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 1 after subtracting 63 from 64.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 63

Step 3:
63 goes into 13 0 times with a remainder of 13.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 13, we get 13.
Grab the next digit (8) from the dividend, add it to 13, then carry on: 138 / 63

Going ahead to step 4:
138 divided by 63 is 2 with a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 102.0
If we take 126 away from 138, we end up with 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 63

Going ahead to step 5:
If we divide 129 by 63, we get 2 and a remainder of 3.
The next digit of our result is 2. 
Result so far: 1022.0
Subtract 126 from 129 to get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 63

Moving on to step 6:
If we divide 30 by 63, we get 0 and a remainder of 30.
The next digit of our result is 0. 
Result so far: 10220.0
Subtract 0 from 30 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.

Advancing to step 7:
63 can be fit into 300 4 times, resulting in a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 10220.4
Deduct 252 from 300 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.

Let's proceed to step 8:
63 can be fit into 480 7 times, resulting in a remainder of 39.
The next digit of our result is 7. 
Result so far: 10220.47
If we take 441 away from 480, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 9:
63 goes into 390 6 times with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 10220.476
Subtracting 378 from 390 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.

Step 10:
When dividing 120 by 63, we get 1 with a remainder of 57.
Put 1 as the next digit of the answer. 
Result so far: 10220.4761
If we subtract 63 from 120, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 11:
570 divided by 63 is 9 with a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 10220.47619
Subtract 567 from 570 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.

Going ahead to step 12:
30 divided by 63 is 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 10220.47619
Subtracting 0 from 30 leaves us 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.

Advancing to step 13:
When dividing 300 by 63, we get 4 with a remainder of 48.
The next digit of our result is 4. 
Result so far: 10220.4761904
Deduct 252 from 300 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.

Moving on to step 14:
When dividing 480 by 63, we get 7 with a remainder of 39.
Use 7 as the next digit of our solution. 
Result so far: 10220.47619047
If we take 441 away from 480, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

In conclusion, the division gives 10220.47619047 with a balance of 3.9e-08.