636440 ÷ 51 
Let's see how many times 51 fits into 636440.

Let's proceed to step 1:
The number 51 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
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 / 51

Going ahead to step 2:
51 goes into 63 1 times with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 12 after subtracting 51 from 63.
Fetch the next digit (6) from the dividend, attach it to 12 and continue: 126 / 51

Let's proceed to step 3:
51 goes into 126 2 times with a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 12.0
The remainder is 24 after subtracting 102 from 126.
Grab the next digit (4) from the dividend, add it to 24, then carry on: 244 / 51

Moving on to step 4:
51 can be fit into 244 4 times, resulting in a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 124.0
Subtracting 204 from 244 leaves us with 40.
Grab the next digit (4) from the dividend, add it to 40, then carry on: 404 / 51

Going ahead to step 5:
If we divide 404 by 51, we get 7 and a remainder of 47.
Write down 7 as next digit of the result. 
Result so far: 1247.0
If we subtract 357 from 404, we get 47.
Bring next digit (0) of the dividend behind the 47 and repeat the process: 470 / 51

Step 6:
51 goes into 470 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 12479.0
Subtracting 459 from 470 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 7:
51 goes into 110 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 12479.2
Deduct 102 from 110 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
51 can be fit into 80 1 times, resulting in a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 12479.21
The remainder is 29 after subtracting 51 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 9:
When dividing 290 by 51, we get 5 with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 12479.215
If we take 255 away from 290, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 10:
If we divide 350 by 51, we get 6 and a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 12479.2156
Deduct 306 from 350 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 11:
The number 51 fits into 440 8 times, leaving a remainder of 32.
The next digit of our result is 8. 
Result so far: 12479.21568
If we subtract 408 from 440, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 12:
51 goes into 320 6 times with a remainder of 14.
The next digit of our result is 6. 
Result so far: 12479.215686
Subtracting 306 from 320 leaves us 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.

On to step 13:
51 can be fit into 140 2 times, resulting in a remainder of 38.
The next digit of our result is 2. 
Result so far: 12479.2156862
If we subtract 102 from 140, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 14:
51 goes into 380 7 times with a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 12479.21568627
If we take 357 away from 380, we end up 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.

The quotient of the division is 12479.21568627, and the remainder is 2.3e-08.