We look at the division of 66921080 by 609 
We want to divide 66921080 by 609.

Step 1:
6 divided by 609 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 609

Step 2:
If we divide 66 by 609, we get 0 and a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Grab the next digit (9) from the dividend, add it to 66, then carry on: 669 / 609

Step 3:
609 can be fit into 669 1 times, resulting in a remainder of 60.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 609 from 669 and we're left with 60.
Append the next digit (2) from the dividend to 60 and continue with: 602 / 609

Advancing to step 4:
609 goes into 602 0 times with a remainder of 602.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 602 after subtracting 0 from 602.
Bring next digit (1) of the dividend behind the 602 and repeat the process: 6021 / 609

On to step 5:
6021 divided by 609 is 9 with a remainder of 540.
The next digit of our result is 9. 
Result so far: 109.0
The remainder is 540 after subtracting 5481 from 6021.
Grab the next digit (0) from the dividend, add it to 540, then carry on: 5400 / 609

On to step 6:
The number 609 fits into 5400 8 times, leaving a remainder of 528.
Put 8 as the next digit of the answer. 
Result so far: 1098.0
Deduct 4872 from 5400 and we're left with 528.
Grab the next digit (8) from the dividend, add it to 528, then carry on: 5288 / 609

On to step 7:
The number 609 fits into 5288 8 times, leaving a remainder of 416.
The number 8 becomes the next digit in our result. 
Result so far: 10988.0
The remainder is 416 after subtracting 4872 from 5288.
Include the next digit (0) from the dividend after 416, then repeat: 4160 / 609

On to step 8:
609 goes into 4160 6 times with a remainder of 506.
The number 6 becomes the next digit in our result. 
Result so far: 109886.0
The remainder is 506 after subtracting 3654 from 4160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5060, and continue the process.

Let's proceed to step 9:
If we divide 5060 by 609, we get 8 and a remainder of 188.
Use 8 as the next digit of our solution. 
Result so far: 109886.8
Subtracting 4872 from 5060 leaves us with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 10:
When dividing 1880 by 609, we get 3 with a remainder of 53.
Record the quotient 3 as the next digit in the result. 
Result so far: 109886.83
The remainder is 53 after subtracting 1827 from 1880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Going ahead to step 11:
The number 609 fits into 530 0 times, leaving a remainder of 530.
The next digit of our result is 0. 
Result so far: 109886.83
If we take 0 away from 530, we end up with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Let's proceed to step 12:
When dividing 5300 by 609, we get 8 with a remainder of 428.
Record the quotient 8 as the next digit in the result. 
Result so far: 109886.8308
If we take 4872 away from 5300, we end up with 428.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4280, and continue the process.

Step 13:
609 can be fit into 4280 7 times, resulting in a remainder of 17.
The next digit of our result is 7. 
Result so far: 109886.83087
If we subtract 4263 from 4280, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 14:
When dividing 170 by 609, we get 0 with a remainder of 170.
The next digit of our result is 0. 
Result so far: 109886.83087
The remainder is 170 after subtracting 0 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

On to step 15:
When dividing 1700 by 609, we get 2 with a remainder of 482.
Record the quotient 2 as the next digit in the result. 
Result so far: 109886.8308702
The remainder is 482 after subtracting 1218 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4820, and continue the process.

Moving on to step 16:
4820 divided by 609 is 7 with a remainder of 557.
Write down 7 as next digit of the result. 
Result so far: 109886.83087027
If we take 4263 away from 4820, we end up with 557.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5570, and continue the process.

After the division, we end up with 109886.83087027 and a remainder of 5.57e-07.