We're dividing 66981390 by 649 
We want to divide 66981390 by 649.

Step 1:
649 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
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 649

Step 2:
If we divide 66 by 649, we get 0 and a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Include the next digit (9) from the dividend after 66, then repeat: 669 / 649

Step 3:
When dividing 669 by 649, we get 1 with a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 20 after subtracting 649 from 669.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 649

Advancing to step 4:
649 can be fit into 208 0 times, resulting in a remainder of 208.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 208 and we're left with 208.
Append the next digit (1) from the dividend to 208 and continue with: 2081 / 649

Moving on to step 5:
If we divide 2081 by 649, we get 3 and a remainder of 134.
The number 3 becomes the next digit in our result. 
Result so far: 103.0
Subtracting 1947 from 2081 leaves us with 134.
Take the next digit (3) from the dividend and append it to 134, then repeat: 1343 / 649

On to step 6:
649 goes into 1343 2 times with a remainder of 45.
The number 2 becomes the next digit in our result. 
Result so far: 1032.0
Subtract 1298 from 1343 to get 45.
Grab the next digit (9) from the dividend, add it to 45, then carry on: 459 / 649

Moving on to step 7:
When dividing 459 by 649, we get 0 with a remainder of 459.
Use 0 as the next digit of our solution. 
Result so far: 10320.0
If we subtract 0 from 459, we get 459.
Take the next digit (0) from the dividend and append it to 459, then repeat: 4590 / 649

Moving on to step 8:
The number 649 fits into 4590 7 times, leaving a remainder of 47.
The number 7 becomes the next digit in our result. 
Result so far: 103207.0
Deduct 4543 from 4590 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Step 9:
If we divide 470 by 649, we get 0 and a remainder of 470.
Write down 0 as next digit of the result. 
Result so far: 103207.0
Subtract 0 from 470 to get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Going ahead to step 10:
The number 649 fits into 4700 7 times, leaving a remainder of 157.
Record the quotient 7 as the next digit in the result. 
Result so far: 103207.07
If we take 4543 away from 4700, we end up with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

Going ahead to step 11:
1570 divided by 649 is 2 with a remainder of 272.
The next digit of our result is 2. 
Result so far: 103207.072
Subtract 1298 from 1570 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Going ahead to step 12:
When dividing 2720 by 649, we get 4 with a remainder of 124.
The number 4 becomes the next digit in our result. 
Result so far: 103207.0724
If we take 2596 away from 2720, we end up with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 13:
When dividing 1240 by 649, we get 1 with a remainder of 591.
The next digit of our result is 1. 
Result so far: 103207.07241
Deduct 649 from 1240 and we're left with 591.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5910, and continue the process.

Let's proceed to step 14:
If we divide 5910 by 649, we get 9 and a remainder of 69.
Write down 9 as next digit of the result. 
Result so far: 103207.072419
Deduct 5841 from 5910 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 15:
649 goes into 690 1 times with a remainder of 41.
Put 1 as the next digit of the answer. 
Result so far: 103207.0724191
The remainder is 41 after subtracting 649 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 16:
The number 649 fits into 410 0 times, leaving a remainder of 410.
Write down 0 as next digit of the result. 
Result so far: 103207.0724191
Subtracting 0 from 410 leaves us with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

The final outcome is 103207.0724191, with a leftover of 4.1e-07.