66945498 ÷ 516 
Our goal is to divide 66945498 by 516.

Step 1:
6 divided by 516 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 516

On to step 2:
If we divide 66 by 516, we get 0 and a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Take the next digit (9) from the dividend and append it to 66, then repeat: 669 / 516

On to step 3:
The number 516 fits into 669 1 times, leaving a remainder of 153.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 516 from 669 and we're left with 153.
Bring next digit (4) of the dividend behind the 153 and repeat the process: 1534 / 516

On to step 4:
516 goes into 1534 2 times with a remainder of 502.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
If we take 1032 away from 1534, we end up with 502.
Include the next digit (5) from the dividend after 502, then repeat: 5025 / 516

Advancing to step 5:
The number 516 fits into 5025 9 times, leaving a remainder of 381.
The next digit of our result is 9. 
Result so far: 129.0
Subtract 4644 from 5025 to get 381.
Bring next digit (4) of the dividend behind the 381 and repeat the process: 3814 / 516

Step 6:
516 can be fit into 3814 7 times, resulting in a remainder of 202.
Record the quotient 7 as the next digit in the result. 
Result so far: 1297.0
If we subtract 3612 from 3814, we get 202.
Bring next digit (9) of the dividend behind the 202 and repeat the process: 2029 / 516

Going ahead to step 7:
2029 divided by 516 is 3 with a remainder of 481.
Record the quotient 3 as the next digit in the result. 
Result so far: 12973.0
Deduct 1548 from 2029 and we're left with 481.
Take the next digit (8) from the dividend and append it to 481, then repeat: 4818 / 516

Step 8:
4818 divided by 516 is 9 with a remainder of 174.
Write down 9 as next digit of the result. 
Result so far: 129739.0
Deduct 4644 from 4818 and we're left with 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Step 9:
The number 516 fits into 1740 3 times, leaving a remainder of 192.
Write down 3 as next digit of the result. 
Result so far: 129739.3
Subtracting 1548 from 1740 leaves us with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Let's proceed to step 10:
The number 516 fits into 1920 3 times, leaving a remainder of 372.
Record the quotient 3 as the next digit in the result. 
Result so far: 129739.33
Subtracting 1548 from 1920 leaves us with 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

After the division, we end up with 129739.33 and a remainder of 0.372.