We look at the division of 66212519 by 661 
We want to divide 66212519 by 661.

Advancing to step 1:
661 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 661

Going ahead to step 2:
66 divided by 661 is 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Grab the next digit (2) from the dividend, add it to 66, then carry on: 662 / 661

Step 3:
If we divide 662 by 661, we get 1 and a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 1 after subtracting 661 from 662.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 661

Let's proceed to step 4:
661 goes into 11 0 times with a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 11 and we're left with 11.
Grab the next digit (2) from the dividend, add it to 11, then carry on: 112 / 661

Advancing to step 5:
The number 661 fits into 112 0 times, leaving a remainder of 112.
The number 0 becomes the next digit in our result. 
Result so far: 100.0
If we take 0 away from 112, we end up with 112.
Bring next digit (5) of the dividend behind the 112 and repeat the process: 1125 / 661

Let's proceed to step 6:
The number 661 fits into 1125 1 times, leaving a remainder of 464.
The next digit of our result is 1. 
Result so far: 1001.0
If we take 661 away from 1125, we end up with 464.
Append the next digit (1) from the dividend to 464 and continue with: 4641 / 661

Moving on to step 7:
If we divide 4641 by 661, we get 7 and a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 10017.0
Deduct 4627 from 4641 and we're left with 14.
Bring next digit (9) of the dividend behind the 14 and repeat the process: 149 / 661

Going ahead to step 8:
661 goes into 149 0 times with a remainder of 149.
Record the quotient 0 as the next digit in the result. 
Result so far: 100170.0
Deduct 0 from 149 and we're left with 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Step 9:
661 can be fit into 1490 2 times, resulting in a remainder of 168.
Use 2 as the next digit of our solution. 
Result so far: 100170.2
If we subtract 1322 from 1490, we get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Advancing to step 10:
661 can be fit into 1680 2 times, resulting in a remainder of 358.
Use 2 as the next digit of our solution. 
Result so far: 100170.22
Subtract 1322 from 1680 to get 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

The final outcome is 100170.22, with a leftover of 0.358.