66129439 ÷ 600 
We want to divide 66129439 by 600.

Going ahead to step 1:
When dividing 6 by 600, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 600

On to step 2:
600 goes into 66 0 times with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Append the next digit (1) from the dividend to 66 and continue with: 661 / 600

Moving on to step 3:
When dividing 661 by 600, we get 1 with a remainder of 61.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 600 from 661, we get 61.
Bring next digit (2) of the dividend behind the 61 and repeat the process: 612 / 600

On to step 4:
600 goes into 612 1 times with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 11.0
If we subtract 600 from 612, we get 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 600

Moving on to step 5:
600 goes into 129 0 times with a remainder of 129.
Write down 0 as next digit of the result. 
Result so far: 110.0
If we take 0 away from 129, we end up with 129.
Append the next digit (4) from the dividend to 129 and continue with: 1294 / 600

Going ahead to step 6:
600 goes into 1294 2 times with a remainder of 94.
The next digit of our result is 2. 
Result so far: 1102.0
The remainder is 94 after subtracting 1200 from 1294.
Fetch the next digit (3) from the dividend, attach it to 94 and continue: 943 / 600

Step 7:
The number 600 fits into 943 1 times, leaving a remainder of 343.
Write down 1 as next digit of the result. 
Result so far: 11021.0
Deduct 600 from 943 and we're left with 343.
Bring next digit (9) of the dividend behind the 343 and repeat the process: 3439 / 600

Step 8:
3439 divided by 600 is 5 with a remainder of 439.
The number 5 becomes the next digit in our result. 
Result so far: 110215.0
Deduct 3000 from 3439 and we're left with 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

Moving on to step 9:
4390 divided by 600 is 7 with a remainder of 190.
Use 7 as the next digit of our solution. 
Result so far: 110215.7
If we take 4200 away from 4390, we end up with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Going ahead to step 10:
The number 600 fits into 1900 3 times, leaving a remainder of 100.
The number 3 becomes the next digit in our result. 
Result so far: 110215.73
The remainder is 100 after subtracting 1800 from 1900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 11:
When dividing 1000 by 600, we get 1 with a remainder of 400.
The next digit of our result is 1. 
Result so far: 110215.731
Subtracting 600 from 1000 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 12:
4000 divided by 600 is 6 with a remainder of 400.
Put 6 as the next digit of the answer. 
Result so far: 110215.7316
Deduct 3600 from 4000 and we're left with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 13:
600 can be fit into 4000 6 times, resulting in a remainder of 400.
The number 6 becomes the next digit in our result. 
Result so far: 110215.73166
Subtracting 3600 from 4000 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

After the division, we end up with 110215.73166 and a remainder of 0.0004.