We look at the division of 66950648 by 129 
We're looking to find how many times 129 goes into 66950648.

On to step 1:
The number 129 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 129

Advancing to step 2:
When dividing 66 by 129, we get 0 with 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.
Append the next digit (9) from the dividend to 66 and continue with: 669 / 129

Going ahead to step 3:
If we divide 669 by 129, we get 5 and a remainder of 24.
The next digit of our result is 5. 
Result so far: 5.0
Deduct 645 from 669 and we're left with 24.
Bring next digit (5) of the dividend behind the 24 and repeat the process: 245 / 129

Let's proceed to step 4:
When dividing 245 by 129, we get 1 with a remainder of 116.
Use 1 as the next digit of our solution. 
Result so far: 51.0
If we subtract 129 from 245, we get 116.
Bring next digit (0) of the dividend behind the 116 and repeat the process: 1160 / 129

Step 5:
When dividing 1160 by 129, we get 8 with a remainder of 128.
The next digit of our result is 8. 
Result so far: 518.0
Subtracting 1032 from 1160 leaves us with 128.
Grab the next digit (6) from the dividend, add it to 128, then carry on: 1286 / 129

Advancing to step 6:
If we divide 1286 by 129, we get 9 and a remainder of 125.
Put 9 as the next digit of the answer. 
Result so far: 5189.0
Deduct 1161 from 1286 and we're left with 125.
Include the next digit (4) from the dividend after 125, then repeat: 1254 / 129

Let's proceed to step 7:
1254 divided by 129 is 9 with a remainder of 93.
Record the quotient 9 as the next digit in the result. 
Result so far: 51899.0
If we take 1161 away from 1254, we end up with 93.
Bring next digit (8) of the dividend behind the 93 and repeat the process: 938 / 129

Moving on to step 8:
129 can be fit into 938 7 times, resulting in a remainder of 35.
Use 7 as the next digit of our solution. 
Result so far: 518997.0
Subtracting 903 from 938 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 9:
350 divided by 129 is 2 with a remainder of 92.
Use 2 as the next digit of our solution. 
Result so far: 518997.2
Deduct 258 from 350 and we're left with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Advancing to step 10:
The number 129 fits into 920 7 times, leaving a remainder of 17.
Write down 7 as next digit of the result. 
Result so far: 518997.27
Deduct 903 from 920 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 11:
The number 129 fits into 170 1 times, leaving a remainder of 41.
The number 1 becomes the next digit in our result. 
Result so far: 518997.271
If we subtract 129 from 170, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 12:
If we divide 410 by 129, we get 3 and a remainder of 23.
Record the quotient 3 as the next digit in the result. 
Result so far: 518997.2713
The remainder is 23 after subtracting 387 from 410.
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:
When dividing 230 by 129, we get 1 with a remainder of 101.
Put 1 as the next digit of the answer. 
Result so far: 518997.27131
Subtracting 129 from 230 leaves us with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Advancing to step 14:
If we divide 1010 by 129, we get 7 and a remainder of 107.
Write down 7 as next digit of the result. 
Result so far: 518997.271317
Subtracting 903 from 1010 leaves us with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Advancing to step 15:
The number 129 fits into 1070 8 times, leaving a remainder of 38.
The number 8 becomes the next digit in our result. 
Result so far: 518997.2713178
If we subtract 1032 from 1070, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 16:
If we divide 380 by 129, we get 2 and a remainder of 122.
Use 2 as the next digit of our solution. 
Result so far: 518997.27131782
Deduct 258 from 380 and we're left with 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

The final outcome is 518997.27131782, with a leftover of 1.22e-07.