We're dividing 421339 by 23 
We want to divide 421339 by 23.

Moving on to step 1:
The number 23 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 23

Advancing to step 2:
23 can be fit into 42 1 times, resulting in a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 23 from 42 leaves us with 19.
Grab the next digit (1) from the dividend, add it to 19, then carry on: 191 / 23

Let's proceed to step 3:
191 divided by 23 is 8 with a remainder of 7.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
Deduct 184 from 191 and we're left with 7.
Bring next digit (3) of the dividend behind the 7 and repeat the process: 73 / 23

Going ahead to step 4:
When dividing 73 by 23, we get 3 with a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 183.0
Deduct 69 from 73 and we're left with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 23

Step 5:
43 divided by 23 is 1 with a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 1831.0
Deduct 23 from 43 and we're left with 20.
Bring next digit (9) of the dividend behind the 20 and repeat the process: 209 / 23

Advancing to step 6:
209 divided by 23 is 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 18319.0
If we take 207 away from 209, 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.

Advancing to 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: 18319.0
If we subtract 0 from 20, we 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.

Moving on to step 8:
200 divided by 23 is 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 18319.08
Subtracting 184 from 200 leaves us 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.

Going ahead to 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: 18319.086
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.

Moving on to step 10:
When dividing 220 by 23, we get 9 with a remainder of 13.
Write down 9 as next digit of the result. 
Result so far: 18319.0869
Subtracting 207 from 220 leaves us 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.

On to step 11:
23 can be fit into 130 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 18319.08695
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.

Moving on to step 12:
When dividing 150 by 23, we get 6 with a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 18319.086956
If we subtract 138 from 150, we 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.

Let's proceed to step 13:
When dividing 120 by 23, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 18319.0869565
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.

Step 14:
50 divided by 23 is 2 with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 18319.08695652
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.

Our division results in 18319.08695652 with a remaining 4e-09.