638436 ÷ 23 
We're looking to find how many times 23 goes into 638436.

Advancing to step 1:
When dividing 6 by 23, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 23

Moving on to step 2:
The number 23 fits into 63 2 times, leaving a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 46 from 63 and we're left with 17.
Fetch the next digit (8) from the dividend, attach it to 17 and continue: 178 / 23

Step 3:
23 goes into 178 7 times with a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 27.0
Subtracting 161 from 178 leaves us with 17.
Take the next digit (4) from the dividend and append it to 17, then repeat: 174 / 23

Step 4:
The number 23 fits into 174 7 times, leaving a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 277.0
Subtracting 161 from 174 leaves us with 13.
Take the next digit (3) from the dividend and append it to 13, then repeat: 133 / 23

Advancing to step 5:
23 goes into 133 5 times with a remainder of 18.
Write down 5 as next digit of the result. 
Result so far: 2775.0
Deduct 115 from 133 and we're left with 18.
Grab the next digit (6) from the dividend, add it to 18, then carry on: 186 / 23

On to step 6:
When dividing 186 by 23, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 27758.0
If we take 184 away from 186, we end up 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.

Moving on to step 7:
20 divided by 23 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 27758.0
If we take 0 away from 20, we end up 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.

Step 8:
The number 23 fits into 200 8 times, leaving a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 27758.08
Deduct 184 from 200 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 9:
If we divide 160 by 23, we get 6 and a remainder of 22.
Use 6 as the next digit of our solution. 
Result so far: 27758.086
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 goes into 220 9 times with a remainder of 13.
Use 9 as the next digit of our solution. 
Result so far: 27758.0869
If we take 207 away from 220, we end up 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.

Advancing to step 11:
23 can be fit into 130 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 27758.08695
If we take 115 away from 130, we end up with 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 12:
The number 23 fits into 150 6 times, leaving a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 27758.086956
Subtract 138 from 150 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
23 can be fit into 120 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 27758.0869565
If we subtract 115 from 120, we 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.

Step 14:
The number 23 fits into 50 2 times, leaving a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 27758.08695652
Subtract 46 from 50 to 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.

After the division, we end up with 27758.08695652 and a remainder of 4e-09.