321907 ÷ 66 
We want to divide 321907 by 66.

Step 1:
The number 66 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (2) from the dividend after 3, then repeat: 32 / 66

Moving on to step 2:
If we divide 32 by 66, we get 0 and a remainder of 32.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 32, we get 32.
Append the next digit (1) from the dividend to 32 and continue with: 321 / 66

On to step 3:
66 can be fit into 321 4 times, resulting in a remainder of 57.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 264 from 321 leaves us with 57.
Fetch the next digit (9) from the dividend, attach it to 57 and continue: 579 / 66

Let's proceed to step 4:
579 divided by 66 is 8 with a remainder of 51.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
Deduct 528 from 579 and we're left with 51.
Take the next digit (0) from the dividend and append it to 51, then repeat: 510 / 66

On to step 5:
510 divided by 66 is 7 with a remainder of 48.
Use 7 as the next digit of our solution. 
Result so far: 487.0
If we subtract 462 from 510, we get 48.
Take the next digit (7) from the dividend and append it to 48, then repeat: 487 / 66

Moving on to step 6:
487 divided by 66 is 7 with a remainder of 25.
The next digit of our result is 7. 
Result so far: 4877.0
Subtracting 462 from 487 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 7:
The number 66 fits into 250 3 times, leaving a remainder of 52.
Write down 3 as next digit of the result. 
Result so far: 4877.3
Subtracting 198 from 250 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 8:
When dividing 520 by 66, we get 7 with a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 4877.37
The remainder is 58 after subtracting 462 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 9:
66 can be fit into 580 8 times, resulting in a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 4877.378
Deduct 528 from 580 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 10:
66 goes into 520 7 times with a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 4877.3787
The remainder is 58 after subtracting 462 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 11:
66 can be fit into 580 8 times, resulting in a remainder of 52.
Write down 8 as next digit of the result. 
Result so far: 4877.37878
The remainder is 52 after subtracting 528 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 12:
When dividing 520 by 66, we get 7 with a remainder of 58.
Use 7 as the next digit of our solution. 
Result so far: 4877.378787
If we take 462 away from 520, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 13:
When dividing 580 by 66, we get 8 with a remainder of 52.
The next digit of our result is 8. 
Result so far: 4877.3787878
Subtract 528 from 580 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 14:
66 can be fit into 520 7 times, resulting in a remainder of 58.
The next digit of our result is 7. 
Result so far: 4877.37878787
If we take 462 away from 520, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

In conclusion, the division gives 4877.37878787 with a balance of 5.8e-08.