We're dividing 405190 by 23 
We want to figure out the number of times 405190 can be divided by 23.

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
Deduct 0 from 4 and we're left with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 23

Let's proceed to step 2:
If we divide 40 by 23, we get 1 and a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 17 after subtracting 23 from 40.
Take the next digit (5) from the dividend and append it to 17, then repeat: 175 / 23

Moving on to step 3:
23 goes into 175 7 times with a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Deduct 161 from 175 and we're left with 14.
Grab the next digit (1) from the dividend, add it to 14, then carry on: 141 / 23

Moving on to step 4:
If we divide 141 by 23, we get 6 and a remainder of 3.
Put 6 as the next digit of the answer. 
Result so far: 176.0
If we subtract 138 from 141, we get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 23

On to step 5:
If we divide 39 by 23, we get 1 and a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 1761.0
If we take 23 away from 39, we end up with 16.
Take the next digit (0) from the dividend and append it to 16, then repeat: 160 / 23

On to step 6:
The number 23 fits into 160 6 times, leaving a remainder of 22.
The next digit of our result is 6. 
Result so far: 17616.0
Subtract 138 from 160 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 7:
23 goes into 220 9 times with a remainder of 13.
The next digit of our result is 9. 
Result so far: 17616.9
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.

Step 8:
The number 23 fits into 130 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 17616.95
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.

Advancing to step 9:
23 goes into 150 6 times with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 17616.956
Subtracting 138 from 150 leaves us 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 10:
120 divided by 23 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 17616.9565
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.

Let's proceed to step 11:
23 goes into 50 2 times with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 17616.95652
If we take 46 away from 50, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
The number 23 fits into 40 1 times, leaving a remainder of 17.
The next digit of our result is 1. 
Result so far: 17616.956521
Subtract 23 from 40 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 13:
If we divide 170 by 23, we get 7 and a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 17616.9565217
If we subtract 161 from 170, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 14:
90 divided by 23 is 3 with a remainder of 21.
Write down 3 as next digit of the result. 
Result so far: 17616.95652173
Subtracting 69 from 90 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Our division results in 17616.95652173 with a remaining 2.1e-08.