661630 ÷ 2 
The aim is to understand the frequency of 2 in 661630.

On to step 1:
2 can be fit into 6 3 times, resulting in a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 6 from 6 to get 0.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 2

Step 2:
2 goes into 6 3 times with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
The remainder is 0 after subtracting 6 from 6.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 2

Going ahead to step 3:
When dividing 1 by 2, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 330.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 2

Moving on to step 4:
2 goes into 16 8 times with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 3308.0
If we take 16 away from 16, we end up with 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 2

Going ahead to step 5:
When dividing 3 by 2, we get 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 33081.0
If we subtract 2 from 3, we get 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 2

Going ahead to step 6:
The number 2 fits into 10 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 330815.0
Subtract 10 from 10 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
2 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 330815.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
2 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 330815.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 330815.0, with a leftover of 0.0.