45593105 ÷ 643 
Our goal is to divide 45593105 by 643.

Step 1:
When dividing 4 by 643, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 643

On to step 2:
When dividing 45 by 643, we get 0 with a remainder of 45.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 45, we get 45.
Append the next digit (5) from the dividend to 45 and continue with: 455 / 643

Advancing to step 3:
643 can be fit into 455 0 times, resulting in a remainder of 455.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 455 and we're left with 455.
Grab the next digit (9) from the dividend, add it to 455, then carry on: 4559 / 643

Advancing to step 4:
643 can be fit into 4559 7 times, resulting in a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtract 4501 from 4559 to get 58.
Grab the next digit (3) from the dividend, add it to 58, then carry on: 583 / 643

Advancing to step 5:
If we divide 583 by 643, we get 0 and a remainder of 583.
Record the quotient 0 as the next digit in the result. 
Result so far: 70.0
Subtracting 0 from 583 leaves us with 583.
Append the next digit (1) from the dividend to 583 and continue with: 5831 / 643

Let's proceed to step 6:
5831 divided by 643 is 9 with a remainder of 44.
Write down 9 as next digit of the result. 
Result so far: 709.0
If we subtract 5787 from 5831, we get 44.
Grab the next digit (0) from the dividend, add it to 44, then carry on: 440 / 643

On to step 7:
440 divided by 643 is 0 with a remainder of 440.
Write down 0 as next digit of the result. 
Result so far: 7090.0
The remainder is 440 after subtracting 0 from 440.
Include the next digit (5) from the dividend after 440, then repeat: 4405 / 643

Advancing to step 8:
The number 643 fits into 4405 6 times, leaving a remainder of 547.
Write down 6 as next digit of the result. 
Result so far: 70906.0
If we subtract 3858 from 4405, we get 547.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5470, and continue the process.

On to step 9:
If we divide 5470 by 643, we get 8 and a remainder of 326.
Put 8 as the next digit of the answer. 
Result so far: 70906.8
If we take 5144 away from 5470, we end up with 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Going ahead to step 10:
3260 divided by 643 is 5 with a remainder of 45.
The next digit of our result is 5. 
Result so far: 70906.85
Deduct 3215 from 3260 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 11:
643 can be fit into 450 0 times, resulting in a remainder of 450.
The next digit of our result is 0. 
Result so far: 70906.85
Deduct 0 from 450 and we're left with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Step 12:
If we divide 4500 by 643, we get 6 and a remainder of 642.
Put 6 as the next digit of the answer. 
Result so far: 70906.8506
Subtracting 3858 from 4500 leaves us with 642.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6420, and continue the process.

Advancing to step 13:
The number 643 fits into 6420 9 times, leaving a remainder of 633.
The number 9 becomes the next digit in our result. 
Result so far: 70906.85069
Subtracting 5787 from 6420 leaves us with 633.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6330, and continue the process.

On to step 14:
When dividing 6330 by 643, we get 9 with a remainder of 543.
Record the quotient 9 as the next digit in the result. 
Result so far: 70906.850699
If we subtract 5787 from 6330, we get 543.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5430, and continue the process.

The final result is 70906.850699 with a remainder of 5.43e-05.