We're dividing 661640 by 99 
We want to figure out the number of times 661640 can be divided by 99.

On to step 1:
99 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 99

Step 2:
66 divided by 99 is 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Bring next digit (1) of the dividend behind the 66 and repeat the process: 661 / 99

Step 3:
99 goes into 661 6 times with a remainder of 67.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 67 after subtracting 594 from 661.
Append the next digit (6) from the dividend to 67 and continue with: 676 / 99

Step 4:
99 can be fit into 676 6 times, resulting in a remainder of 82.
Put 6 as the next digit of the answer. 
Result so far: 66.0
Subtracting 594 from 676 leaves us with 82.
Include the next digit (4) from the dividend after 82, then repeat: 824 / 99

Advancing to step 5:
99 goes into 824 8 times with a remainder of 32.
The next digit of our result is 8. 
Result so far: 668.0
Subtracting 792 from 824 leaves us with 32.
Take the next digit (0) from the dividend and append it to 32, then repeat: 320 / 99

Moving on to step 6:
320 divided by 99 is 3 with a remainder of 23.
Record the quotient 3 as the next digit in the result. 
Result so far: 6683.0
Deduct 297 from 320 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 7:
When dividing 230 by 99, we get 2 with a remainder of 32.
Write down 2 as next digit of the result. 
Result so far: 6683.2
The remainder is 32 after subtracting 198 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 8:
320 divided by 99 is 3 with a remainder of 23.
Write down 3 as next digit of the result. 
Result so far: 6683.23
The remainder is 23 after subtracting 297 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 9:
The number 99 fits into 230 2 times, leaving a remainder of 32.
Write down 2 as next digit of the result. 
Result so far: 6683.232
Subtract 198 from 230 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 10:
99 can be fit into 320 3 times, resulting in a remainder of 23.
Put 3 as the next digit of the answer. 
Result so far: 6683.2323
Subtracting 297 from 320 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 11:
99 goes into 230 2 times with a remainder of 32.
Use 2 as the next digit of our solution. 
Result so far: 6683.23232
If we take 198 away from 230, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 12:
320 divided by 99 is 3 with a remainder of 23.
The number 3 becomes the next digit in our result. 
Result so far: 6683.232323
The remainder is 23 after subtracting 297 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 13:
If we divide 230 by 99, we get 2 and a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 6683.2323232
The remainder is 32 after subtracting 198 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 14:
When dividing 320 by 99, we get 3 with a remainder of 23.
Write down 3 as next digit of the result. 
Result so far: 6683.23232323
The remainder is 23 after subtracting 297 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

The final result is 6683.23232323 with a remainder of 2.3e-08.