Let's divide 661999 by 3
We want to divide 661999 by 3.

On to step 1:
6 divided by 3 is 2 with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 6 from 6 to get 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 3

Going ahead to step 2:
6 divided by 3 is 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 22.0
If we subtract 6 from 6, we get 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 3

Step 3:
3 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 220.0
Subtract 0 from 1 to get 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 3

Going ahead to step 4:
The number 3 fits into 19 6 times, leaving a remainder of 1.
Record the quotient 6 as the next digit in the result. 
Result so far: 2206.0
If we subtract 18 from 19, we get 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 3

Advancing to step 5:
If we divide 19 by 3, we get 6 and a remainder of 1.
Use 6 as the next digit of our solution. 
Result so far: 22066.0
If we take 18 away from 19, we end up with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 3

Step 6:
19 divided by 3 is 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 220666.0
Subtract 18 from 19 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
10 divided by 3 is 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 220666.3
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 8:
3 goes into 10 3 times with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 220666.33
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 220666.33 and a remainder of 0.001.