We divide 287640 by 23
We're looking to find how many times 23 goes into 287640.

Moving on to step 1:
2 divided by 23 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 23

Let's proceed to step 2:
23 can be fit into 28 1 times, resulting in a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 23 from 28 and we're left with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 23

Moving on to step 3:
If we divide 57 by 23, we get 2 and a remainder of 11.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
If we take 46 away from 57, we end up with 11.
Bring next digit (6) of the dividend behind the 11 and repeat the process: 116 / 23

Moving on to step 4:
116 divided by 23 is 5 with a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 125.0
The remainder is 1 after subtracting 115 from 116.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 23

Going ahead to step 5:
The number 23 fits into 14 0 times, leaving a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 1250.0
The remainder is 14 after subtracting 0 from 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 23

Moving on to step 6:
If we divide 140 by 23, we get 6 and a remainder of 2.
The next digit of our result is 6. 
Result so far: 12506.0
Subtract 138 from 140 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 7:
23 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 12506.0
Deduct 0 from 20 and we're left with 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 8:
If we divide 200 by 23, we get 8 and a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 12506.08
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 9:
The number 23 fits into 160 6 times, leaving a remainder of 22.
Record the quotient 6 as the next digit in the result. 
Result so far: 12506.086
Deduct 138 from 160 and we're left 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.

Step 10:
23 can be fit into 220 9 times, resulting in a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 12506.0869
Subtract 207 from 220 to get 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 11:
If we divide 130 by 23, we get 5 and a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 12506.08695
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.

Moving on to step 12:
23 goes into 150 6 times with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 12506.086956
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 13:
The number 23 fits into 120 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 12506.0869565
Subtract 115 from 120 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 14:
23 goes into 50 2 times with a remainder of 4.
The next digit of our result is 2. 
Result so far: 12506.08695652
If we subtract 46 from 50, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 12506.08695652 with a remainder of 4e-09.