Let's divide 639420 by 23
We want to figure out the number of times 639420 can be divided by 23.

Let's proceed to step 1:
23 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 23

Moving on to step 2:
The number 23 fits into 63 2 times, leaving a remainder of 17.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 46 from 63 leaves us with 17.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 23

On to step 3:
23 goes into 179 7 times with a remainder of 18.
Write down 7 as next digit of the result. 
Result so far: 27.0
Deduct 161 from 179 and we're left with 18.
Take the next digit (4) from the dividend and append it to 18, then repeat: 184 / 23

Let's proceed to step 4:
23 can be fit into 184 8 times, resulting in a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 278.0
Subtract 184 from 184 to get 0.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 23

Going ahead to step 5:
When dividing 2 by 23, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 2780.0
If we subtract 0 from 2, we get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 23

Advancing to step 6:
23 can be fit into 20 0 times, resulting in a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 27800.0
Subtracting 0 from 20 leaves us 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.

Advancing to step 7:
23 goes into 200 8 times with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 27800.8
If we take 184 away from 200, we end up 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.

Let's proceed to step 8:
23 goes into 160 6 times with a remainder of 22.
Write down 6 as next digit of the result. 
Result so far: 27800.86
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.

Going ahead to step 9:
220 divided by 23 is 9 with a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 27800.869
If we subtract 207 from 220, we 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.

On to step 10:
If we divide 130 by 23, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 27800.8695
Deduct 115 from 130 and we're left 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.

Let's proceed to step 11:
When dividing 150 by 23, we get 6 with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 27800.86956
Deduct 138 from 150 and we're left 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 12:
The number 23 fits into 120 5 times, leaving a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 27800.869565
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.

Step 13:
50 divided by 23 is 2 with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 27800.8695652
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.

On to step 14:
23 can be fit into 40 1 times, resulting in a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 27800.86956521
Subtracting 23 from 40 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final result is 27800.86956521 with a remainder of 1.7e-08.