581391 ÷ 66 
We want to figure out the number of times 581391 can be divided by 66.

Step 1:
66 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 66

Advancing to step 2:
66 can be fit into 58 0 times, resulting in a remainder of 58.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 58 and we're left with 58.
Append the next digit (1) from the dividend to 58 and continue with: 581 / 66

On to step 3:
66 can be fit into 581 8 times, resulting in a remainder of 53.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we take 528 away from 581, we end up with 53.
Take the next digit (3) from the dividend and append it to 53, then repeat: 533 / 66

On to step 4:
66 can be fit into 533 8 times, resulting in a remainder of 5.
Record the quotient 8 as the next digit in the result. 
Result so far: 88.0
If we take 528 away from 533, we end up with 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 66

Moving on to step 5:
If we divide 59 by 66, we get 0 and a remainder of 59.
Record the quotient 0 as the next digit in the result. 
Result so far: 880.0
If we subtract 0 from 59, we get 59.
Include the next digit (1) from the dividend after 59, then repeat: 591 / 66

Advancing to step 6:
591 divided by 66 is 8 with a remainder of 63.
The number 8 becomes the next digit in our result. 
Result so far: 8808.0
The remainder is 63 after subtracting 528 from 591.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 7:
630 divided by 66 is 9 with a remainder of 36.
Record the quotient 9 as the next digit in the result. 
Result so far: 8808.9
If we take 594 away from 630, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 8:
If we divide 360 by 66, we get 5 and a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 8808.95
If we subtract 330 from 360, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 9:
300 divided by 66 is 4 with a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 8808.954
Subtract 264 from 300 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 10:
360 divided by 66 is 5 with a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 8808.9545
Deduct 330 from 360 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
300 divided by 66 is 4 with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 8808.95454
If we take 264 away from 300, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 12:
66 can be fit into 360 5 times, resulting in a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 8808.954545
The remainder is 30 after subtracting 330 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 13:
66 can be fit into 300 4 times, resulting in a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 8808.9545454
Deduct 264 from 300 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 14:
The number 66 fits into 360 5 times, leaving a remainder of 30.
The next digit of our result is 5. 
Result so far: 8808.95454545
Subtract 330 from 360 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Our division results in 8808.95454545 with a remaining 3e-08.