51575048 ÷ 643 
Let's see how many times 643 fits into 51575048.

Let's proceed to step 1:
If we divide 5 by 643, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 643

Let's proceed to step 2:
51 divided by 643 is 0 with a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Bring next digit (5) of the dividend behind the 51 and repeat the process: 515 / 643

Advancing to step 3:
If we divide 515 by 643, we get 0 and a remainder of 515.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 515, we end up with 515.
Take the next digit (7) from the dividend and append it to 515, then repeat: 5157 / 643

Moving on to step 4:
643 can be fit into 5157 8 times, resulting in a remainder of 13.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 5144 from 5157 and we're left with 13.
Fetch the next digit (5) from the dividend, attach it to 13 and continue: 135 / 643

On to step 5:
When dividing 135 by 643, we get 0 with a remainder of 135.
Put 0 as the next digit of the answer. 
Result so far: 80.0
Subtract 0 from 135 to get 135.
Bring next digit (0) of the dividend behind the 135 and repeat the process: 1350 / 643

Step 6:
When dividing 1350 by 643, we get 2 with a remainder of 64.
Record the quotient 2 as the next digit in the result. 
Result so far: 802.0
Subtracting 1286 from 1350 leaves us with 64.
Bring next digit (4) of the dividend behind the 64 and repeat the process: 644 / 643

Going ahead to step 7:
If we divide 644 by 643, we get 1 and a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 8021.0
If we take 643 away from 644, we end up with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 643

Advancing to step 8:
If we divide 18 by 643, we get 0 and a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 80210.0
Subtract 0 from 18 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 9:
643 can be fit into 180 0 times, resulting in a remainder of 180.
The next digit of our result is 0. 
Result so far: 80210.0
The remainder is 180 after subtracting 0 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Let's proceed to step 10:
When dividing 1800 by 643, we get 2 with a remainder of 514.
Write down 2 as next digit of the result. 
Result so far: 80210.02
Subtracting 1286 from 1800 leaves us with 514.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5140, and continue the process.

On to step 11:
If we divide 5140 by 643, we get 7 and a remainder of 639.
The next digit of our result is 7. 
Result so far: 80210.027
If we take 4501 away from 5140, we end up with 639.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6390, and continue the process.

Going ahead to step 12:
The number 643 fits into 6390 9 times, leaving a remainder of 603.
The next digit of our result is 9. 
Result so far: 80210.0279
The remainder is 603 after subtracting 5787 from 6390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6030, and continue the process.

Going ahead to step 13:
643 can be fit into 6030 9 times, resulting in a remainder of 243.
Use 9 as the next digit of our solution. 
Result so far: 80210.02799
Deduct 5787 from 6030 and we're left with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

The quotient of the division is 80210.02799, and the remainder is 0.000243.