20381 ÷ 51 
We want to figure out the number of times 20381 can be divided by 51.

Step 1:
2 divided by 51 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 51

Let's proceed to step 2:
51 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 20 and we're left with 20.
Include the next digit (3) from the dividend after 20, then repeat: 203 / 51

Let's proceed to step 3:
51 can be fit into 203 3 times, resulting in a remainder of 50.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 153 from 203, we get 50.
Grab the next digit (8) from the dividend, add it to 50, then carry on: 508 / 51

Step 4:
If we divide 508 by 51, we get 9 and a remainder of 49.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
Deduct 459 from 508 and we're left with 49.
Grab the next digit (1) from the dividend, add it to 49, then carry on: 491 / 51

Moving on to step 5:
If we divide 491 by 51, we get 9 and a remainder of 32.
Put 9 as the next digit of the answer. 
Result so far: 399.0
The remainder is 32 after subtracting 459 from 491.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 6:
51 goes into 320 6 times with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 399.6
Deduct 306 from 320 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 7:
The number 51 fits into 140 2 times, leaving a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 399.62
The remainder is 38 after subtracting 102 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 8:
The number 51 fits into 380 7 times, leaving a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 399.627
Subtracting 357 from 380 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 9:
230 divided by 51 is 4 with a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 399.6274
Deduct 204 from 230 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 10:
If we divide 260 by 51, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 399.62745
Deduct 255 from 260 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.

Let's proceed to step 11:
51 can be fit into 50 0 times, resulting in a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 399.62745
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 12:
51 goes into 500 9 times with a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 399.6274509
If we subtract 459 from 500, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 13:
When dividing 410 by 51, we get 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 399.62745098
The remainder is 2 after subtracting 408 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 399.62745098 with a remainder of 2e-09.