81543721 ÷ 783 
We want to figure out the number of times 81543721 can be divided by 783.

Let's proceed to step 1:
When dividing 8 by 783, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 783

On to step 2:
783 goes into 81 0 times with a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Fetch the next digit (5) from the dividend, attach it to 81 and continue: 815 / 783

On to step 3:
783 goes into 815 1 times with a remainder of 32.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 783 from 815 leaves us with 32.
Grab the next digit (4) from the dividend, add it to 32, then carry on: 324 / 783

Going ahead to step 4:
324 divided by 783 is 0 with a remainder of 324.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 324, we get 324.
Fetch the next digit (3) from the dividend, attach it to 324 and continue: 3243 / 783

Advancing to step 5:
If we divide 3243 by 783, we get 4 and a remainder of 111.
Use 4 as the next digit of our solution. 
Result so far: 104.0
If we subtract 3132 from 3243, we get 111.
Include the next digit (7) from the dividend after 111, then repeat: 1117 / 783

Going ahead to step 6:
If we divide 1117 by 783, we get 1 and a remainder of 334.
Put 1 as the next digit of the answer. 
Result so far: 1041.0
Subtract 783 from 1117 to get 334.
Bring next digit (2) of the dividend behind the 334 and repeat the process: 3342 / 783

Moving on to step 7:
If we divide 3342 by 783, we get 4 and a remainder of 210.
Put 4 as the next digit of the answer. 
Result so far: 10414.0
Subtracting 3132 from 3342 leaves us with 210.
Grab the next digit (1) from the dividend, add it to 210, then carry on: 2101 / 783

Going ahead to step 8:
When dividing 2101 by 783, we get 2 with a remainder of 535.
The next digit of our result is 2. 
Result so far: 104142.0
The remainder is 535 after subtracting 1566 from 2101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Advancing to step 9:
If we divide 5350 by 783, we get 6 and a remainder of 652.
Write down 6 as next digit of the result. 
Result so far: 104142.6
The remainder is 652 after subtracting 4698 from 5350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6520, and continue the process.

Advancing to step 10:
The number 783 fits into 6520 8 times, leaving a remainder of 256.
The next digit of our result is 8. 
Result so far: 104142.68
If we take 6264 away from 6520, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Going ahead to step 11:
When dividing 2560 by 783, we get 3 with a remainder of 211.
The next digit of our result is 3. 
Result so far: 104142.683
Subtracting 2349 from 2560 leaves us with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

On to step 12:
When dividing 2110 by 783, we get 2 with a remainder of 544.
Record the quotient 2 as the next digit in the result. 
Result so far: 104142.6832
If we take 1566 away from 2110, we end up with 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Let's proceed to step 13:
783 can be fit into 5440 6 times, resulting in a remainder of 742.
Write down 6 as next digit of the result. 
Result so far: 104142.68326
Subtract 4698 from 5440 to get 742.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7420, and continue the process.

Moving on to step 14:
783 goes into 7420 9 times with a remainder of 373.
The number 9 becomes the next digit in our result. 
Result so far: 104142.683269
Subtract 7047 from 7420 to get 373.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3730, and continue the process.

Advancing to step 15:
The number 783 fits into 3730 4 times, leaving a remainder of 598.
Use 4 as the next digit of our solution. 
Result so far: 104142.6832694
If we take 3132 away from 3730, we end up with 598.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5980, and continue the process.

Moving on to step 16:
783 can be fit into 5980 7 times, resulting in a remainder of 499.
Write down 7 as next digit of the result. 
Result so far: 104142.68326947
Subtracting 5481 from 5980 leaves us with 499.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

After the division, we end up with 104142.68326947 and a remainder of 4.99e-07.