74500717 ÷ 643 
We want to figure out the number of times 74500717 can be divided by 643.

Let's proceed to step 1:
If we divide 7 by 643, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 643

Step 2:
The number 643 fits into 74 0 times, leaving a remainder of 74.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 74 leaves us with 74.
Include the next digit (5) from the dividend after 74, then repeat: 745 / 643

Going ahead to step 3:
745 divided by 643 is 1 with a remainder of 102.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 102 after subtracting 643 from 745.
Include the next digit (0) from the dividend after 102, then repeat: 1020 / 643

Step 4:
1020 divided by 643 is 1 with a remainder of 377.
The next digit of our result is 1. 
Result so far: 11.0
Deduct 643 from 1020 and we're left with 377.
Grab the next digit (0) from the dividend, add it to 377, then carry on: 3770 / 643

Let's proceed to step 5:
When dividing 3770 by 643, we get 5 with a remainder of 555.
The number 5 becomes the next digit in our result. 
Result so far: 115.0
Subtracting 3215 from 3770 leaves us with 555.
Append the next digit (7) from the dividend to 555 and continue with: 5557 / 643

Going ahead to step 6:
The number 643 fits into 5557 8 times, leaving a remainder of 413.
The next digit of our result is 8. 
Result so far: 1158.0
If we subtract 5144 from 5557, we get 413.
Grab the next digit (1) from the dividend, add it to 413, then carry on: 4131 / 643

On to step 7:
643 can be fit into 4131 6 times, resulting in a remainder of 273.
The number 6 becomes the next digit in our result. 
Result so far: 11586.0
If we take 3858 away from 4131, we end up with 273.
Take the next digit (7) from the dividend and append it to 273, then repeat: 2737 / 643

Going ahead to step 8:
643 goes into 2737 4 times with a remainder of 165.
Put 4 as the next digit of the answer. 
Result so far: 115864.0
Subtract 2572 from 2737 to get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Advancing to step 9:
If we divide 1650 by 643, we get 2 and a remainder of 364.
The next digit of our result is 2. 
Result so far: 115864.2
If we subtract 1286 from 1650, we get 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Advancing to step 10:
3640 divided by 643 is 5 with a remainder of 425.
Record the quotient 5 as the next digit in the result. 
Result so far: 115864.25
The remainder is 425 after subtracting 3215 from 3640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

On to step 11:
643 can be fit into 4250 6 times, resulting in a remainder of 392.
Put 6 as the next digit of the answer. 
Result so far: 115864.256
If we subtract 3858 from 4250, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Let's proceed to step 12:
The number 643 fits into 3920 6 times, leaving a remainder of 62.
The number 6 becomes the next digit in our result. 
Result so far: 115864.2566
If we take 3858 away from 3920, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

The final result is 115864.2566 with a remainder of 0.00062.