21731 ÷ 51 
We want to divide 21731 by 51.

Step 1:
The number 51 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 51

Step 2:
51 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (7) from the dividend after 21, then repeat: 217 / 51

On to step 3:
When dividing 217 by 51, we get 4 with a remainder of 13.
The next digit of our result is 4. 
Result so far: 4.0
If we take 204 away from 217, we end up with 13.
Fetch the next digit (3) from the dividend, attach it to 13 and continue: 133 / 51

Step 4:
When dividing 133 by 51, we get 2 with a remainder of 31.
Put 2 as the next digit of the answer. 
Result so far: 42.0
If we subtract 102 from 133, we get 31.
Append the next digit (1) from the dividend to 31 and continue with: 311 / 51

On to step 5:
51 goes into 311 6 times with a remainder of 5.
The next digit of our result is 6. 
Result so far: 426.0
Subtracting 306 from 311 leaves us 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.

Going ahead to step 6:
If we divide 50 by 51, we get 0 and a remainder of 50.
The next digit of our result is 0. 
Result so far: 426.0
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 7:
If we divide 500 by 51, we get 9 and a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 426.09
If we take 459 away from 500, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 8:
The number 51 fits into 410 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 426.098
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.

Step 9:
51 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 426.098
Subtract 0 from 20 to 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.

Step 10:
The number 51 fits into 200 3 times, leaving a remainder of 47.
The next digit of our result is 3. 
Result so far: 426.09803
The remainder is 47 after subtracting 153 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 11:
The number 51 fits into 470 9 times, leaving a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 426.098039
The remainder is 11 after subtracting 459 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 12:
When dividing 110 by 51, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 426.0980392
Subtract 102 from 110 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 13:
51 goes into 80 1 times with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 426.09803921
Deduct 51 from 80 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Our division results in 426.09803921 with a remaining 2.9e-08.