43535865 ÷ 641 
We want to figure out the number of times 43535865 can be divided by 641.

Step 1:
4 divided by 641 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 641

On to step 2:
If we divide 43 by 641, we get 0 and a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 43, we end up with 43.
Bring next digit (5) of the dividend behind the 43 and repeat the process: 435 / 641

Moving on to step 3:
When dividing 435 by 641, we get 0 with a remainder of 435.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 435 and we're left with 435.
Bring next digit (3) of the dividend behind the 435 and repeat the process: 4353 / 641

On to step 4:
641 can be fit into 4353 6 times, resulting in a remainder of 507.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 3846 from 4353 leaves us with 507.
Take the next digit (5) from the dividend and append it to 507, then repeat: 5075 / 641

Going ahead to step 5:
If we divide 5075 by 641, we get 7 and a remainder of 588.
Put 7 as the next digit of the answer. 
Result so far: 67.0
If we take 4487 away from 5075, we end up with 588.
Include the next digit (8) from the dividend after 588, then repeat: 5888 / 641

On to step 6:
641 goes into 5888 9 times with a remainder of 119.
Use 9 as the next digit of our solution. 
Result so far: 679.0
Subtracting 5769 from 5888 leaves us with 119.
Include the next digit (6) from the dividend after 119, then repeat: 1196 / 641

Step 7:
641 can be fit into 1196 1 times, resulting in a remainder of 555.
Write down 1 as next digit of the result. 
Result so far: 6791.0
Deduct 641 from 1196 and we're left with 555.
Take the next digit (5) from the dividend and append it to 555, then repeat: 5555 / 641

Step 8:
5555 divided by 641 is 8 with a remainder of 427.
The next digit of our result is 8. 
Result so far: 67918.0
Deduct 5128 from 5555 and we're left with 427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4270, and continue the process.

Advancing to step 9:
641 goes into 4270 6 times with a remainder of 424.
The number 6 becomes the next digit in our result. 
Result so far: 67918.6
The remainder is 424 after subtracting 3846 from 4270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Step 10:
The number 641 fits into 4240 6 times, leaving a remainder of 394.
The next digit of our result is 6. 
Result so far: 67918.66
If we take 3846 away from 4240, we end up with 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

The quotient of the division is 67918.66, and the remainder is 0.394.