We divide 643646 by 23
We're looking to find how many times 23 goes into 643646.

Going ahead to step 1:
23 can be fit into 6 0 times, resulting in a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 23

On to step 2:
23 can be fit into 64 2 times, resulting in a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 46 from 64 leaves us with 18.
Grab the next digit (3) from the dividend, add it to 18, then carry on: 183 / 23

Let's proceed to step 3:
183 divided by 23 is 7 with a remainder of 22.
Put 7 as the next digit of the answer. 
Result so far: 27.0
If we subtract 161 from 183, we get 22.
Grab the next digit (6) from the dividend, add it to 22, then carry on: 226 / 23

Moving on to step 4:
226 divided by 23 is 9 with a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 279.0
Subtracting 207 from 226 leaves us with 19.
Grab the next digit (4) from the dividend, add it to 19, then carry on: 194 / 23

Advancing to step 5:
When dividing 194 by 23, we get 8 with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 2798.0
If we take 184 away from 194, we end up with 10.
Bring next digit (6) of the dividend behind the 10 and repeat the process: 106 / 23

Step 6:
23 goes into 106 4 times with a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 27984.0
The remainder is 14 after subtracting 92 from 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 7:
The number 23 fits into 140 6 times, leaving a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 27984.6
Subtracting 138 from 140 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
If we divide 20 by 23, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 27984.6
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 9:
200 divided by 23 is 8 with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 27984.608
The remainder is 16 after subtracting 184 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 10:
If we divide 160 by 23, we get 6 and a remainder of 22.
The next digit of our result is 6. 
Result so far: 27984.6086
Subtracting 138 from 160 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 11:
If we divide 220 by 23, we get 9 and a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 27984.60869
Deduct 207 from 220 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 12:
130 divided by 23 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 27984.608695
If we subtract 115 from 130, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 13:
23 can be fit into 150 6 times, resulting in a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 27984.6086956
If we take 138 away from 150, we end up 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.

Moving on to step 14:
120 divided by 23 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 27984.60869565
Deduct 115 from 120 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 27984.60869565 with a remainder of 5e-09.