Let's divide 42864990 by 643
We want to figure out the number of times 42864990 can be divided by 643.

On to step 1:
The number 643 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 643

On to step 2:
643 can be fit into 42 0 times, resulting in a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Include the next digit (8) from the dividend after 42, then repeat: 428 / 643

Step 3:
When dividing 428 by 643, we get 0 with a remainder of 428.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 428, we get 428.
Take the next digit (6) from the dividend and append it to 428, then repeat: 4286 / 643

On to step 4:
The number 643 fits into 4286 6 times, leaving a remainder of 428.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 428 after subtracting 3858 from 4286.
Append the next digit (4) from the dividend to 428 and continue with: 4284 / 643

Step 5:
When dividing 4284 by 643, we get 6 with a remainder of 426.
The next digit of our result is 6. 
Result so far: 66.0
Deduct 3858 from 4284 and we're left with 426.
Take the next digit (9) from the dividend and append it to 426, then repeat: 4269 / 643

Advancing to step 6:
4269 divided by 643 is 6 with a remainder of 411.
Put 6 as the next digit of the answer. 
Result so far: 666.0
Subtracting 3858 from 4269 leaves us with 411.
Append the next digit (9) from the dividend to 411 and continue with: 4119 / 643

Let's proceed to step 7:
When dividing 4119 by 643, we get 6 with a remainder of 261.
The number 6 becomes the next digit in our result. 
Result so far: 6666.0
Subtracting 3858 from 4119 leaves us with 261.
Include the next digit (0) from the dividend after 261, then repeat: 2610 / 643

On to step 8:
The number 643 fits into 2610 4 times, leaving a remainder of 38.
The next digit of our result is 4. 
Result so far: 66664.0
The remainder is 38 after subtracting 2572 from 2610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 9:
When dividing 380 by 643, we get 0 with a remainder of 380.
Use 0 as the next digit of our solution. 
Result so far: 66664.0
Deduct 0 from 380 and we're left with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Let's proceed to step 10:
If we divide 3800 by 643, we get 5 and a remainder of 585.
The next digit of our result is 5. 
Result so far: 66664.05
If we take 3215 away from 3800, we end up with 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

Moving on to step 11:
When dividing 5850 by 643, we get 9 with a remainder of 63.
Record the quotient 9 as the next digit in the result. 
Result so far: 66664.059
If we take 5787 away from 5850, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 12:
If we divide 630 by 643, we get 0 and a remainder of 630.
Record the quotient 0 as the next digit in the result. 
Result so far: 66664.059
Deduct 0 from 630 and we're left with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Advancing to step 13:
643 can be fit into 6300 9 times, resulting in a remainder of 513.
The next digit of our result is 9. 
Result so far: 66664.05909
If we take 5787 away from 6300, we end up with 513.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5130, and continue the process.

Let's proceed to step 14:
5130 divided by 643 is 7 with a remainder of 629.
Use 7 as the next digit of our solution. 
Result so far: 66664.059097
Subtracting 4501 from 5130 leaves us with 629.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6290, and continue the process.

Let's proceed to step 15:
If we divide 6290 by 643, we get 9 and a remainder of 503.
Use 9 as the next digit of our solution. 
Result so far: 66664.0590979
If we subtract 5787 from 6290, we get 503.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5030, and continue the process.

On to step 16:
643 can be fit into 5030 7 times, resulting in a remainder of 529.
Record the quotient 7 as the next digit in the result. 
Result so far: 66664.05909797
Subtract 4501 from 5030 to get 529.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5290, and continue the process.

After the division, we end up with 66664.05909797 and a remainder of 5.29e-07.