66840140 ÷ 825 
We want to figure out the number of times 66840140 can be divided by 825.

On to step 1:
825 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 825

Moving on to step 2:
When dividing 66 by 825, we get 0 with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Grab the next digit (8) from the dividend, add it to 66, then carry on: 668 / 825

Step 3:
668 divided by 825 is 0 with a remainder of 668.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 668 leaves us with 668.
Append the next digit (4) from the dividend to 668 and continue with: 6684 / 825

Moving on to step 4:
6684 divided by 825 is 8 with a remainder of 84.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 6600 from 6684 and we're left with 84.
Fetch the next digit (0) from the dividend, attach it to 84 and continue: 840 / 825

Moving on to step 5:
If we divide 840 by 825, we get 1 and a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 81.0
The remainder is 15 after subtracting 825 from 840.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 825

Advancing to step 6:
If we divide 151 by 825, we get 0 and a remainder of 151.
The next digit of our result is 0. 
Result so far: 810.0
If we take 0 away from 151, we end up with 151.
Bring next digit (4) of the dividend behind the 151 and repeat the process: 1514 / 825

Going ahead to step 7:
When dividing 1514 by 825, we get 1 with a remainder of 689.
The number 1 becomes the next digit in our result. 
Result so far: 8101.0
Subtracting 825 from 1514 leaves us with 689.
Include the next digit (0) from the dividend after 689, then repeat: 6890 / 825

On to step 8:
825 goes into 6890 8 times with a remainder of 290.
The number 8 becomes the next digit in our result. 
Result so far: 81018.0
Subtract 6600 from 6890 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 9:
2900 divided by 825 is 3 with a remainder of 425.
Put 3 as the next digit of the answer. 
Result so far: 81018.3
Subtract 2475 from 2900 to get 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Advancing to step 10:
4250 divided by 825 is 5 with a remainder of 125.
Use 5 as the next digit of our solution. 
Result so far: 81018.35
Subtracting 4125 from 4250 leaves us with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 11:
The number 825 fits into 1250 1 times, leaving a remainder of 425.
The next digit of our result is 1. 
Result so far: 81018.351
Subtracting 825 from 1250 leaves us with 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Advancing to step 12:
4250 divided by 825 is 5 with a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 81018.3515
The remainder is 125 after subtracting 4125 from 4250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 13:
The number 825 fits into 1250 1 times, leaving a remainder of 425.
Record the quotient 1 as the next digit in the result. 
Result so far: 81018.35151
The remainder is 425 after subtracting 825 from 1250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Let's proceed to step 14:
825 can be fit into 4250 5 times, resulting in a remainder of 125.
Record the quotient 5 as the next digit in the result. 
Result so far: 81018.351515
The remainder is 125 after subtracting 4125 from 4250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Advancing to step 15:
1250 divided by 825 is 1 with a remainder of 425.
The next digit of our result is 1. 
Result so far: 81018.3515151
Deduct 825 from 1250 and we're left with 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Let's proceed to step 16:
4250 divided by 825 is 5 with a remainder of 125.
Put 5 as the next digit of the answer. 
Result so far: 81018.35151515
Subtract 4125 from 4250 to get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

In conclusion, the division gives 81018.35151515 with a balance of 1.25e-07.