71981921 ÷ 789 
We want to figure out the number of times 71981921 can be divided by 789.

On to step 1:
When dividing 7 by 789, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 789

Going ahead to step 2:
71 divided by 789 is 0 with a remainder of 71.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 71, we end up with 71.
Fetch the next digit (9) from the dividend, attach it to 71 and continue: 719 / 789

Going ahead to step 3:
789 goes into 719 0 times with a remainder of 719.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 719 after subtracting 0 from 719.
Fetch the next digit (8) from the dividend, attach it to 719 and continue: 7198 / 789

Advancing to step 4:
The number 789 fits into 7198 9 times, leaving a remainder of 97.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Deduct 7101 from 7198 and we're left with 97.
Grab the next digit (1) from the dividend, add it to 97, then carry on: 971 / 789

Let's proceed to step 5:
The number 789 fits into 971 1 times, leaving a remainder of 182.
The next digit of our result is 1. 
Result so far: 91.0
Subtracting 789 from 971 leaves us with 182.
Bring next digit (9) of the dividend behind the 182 and repeat the process: 1829 / 789

Going ahead to step 6:
When dividing 1829 by 789, we get 2 with a remainder of 251.
Write down 2 as next digit of the result. 
Result so far: 912.0
The remainder is 251 after subtracting 1578 from 1829.
Append the next digit (2) from the dividend to 251 and continue with: 2512 / 789

Going ahead to step 7:
2512 divided by 789 is 3 with a remainder of 145.
The next digit of our result is 3. 
Result so far: 9123.0
Subtract 2367 from 2512 to get 145.
Include the next digit (1) from the dividend after 145, then repeat: 1451 / 789

On to step 8:
789 goes into 1451 1 times with a remainder of 662.
The next digit of our result is 1. 
Result so far: 91231.0
The remainder is 662 after subtracting 789 from 1451.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6620, and continue the process.

Going ahead to step 9:
If we divide 6620 by 789, we get 8 and a remainder of 308.
Record the quotient 8 as the next digit in the result. 
Result so far: 91231.8
If we subtract 6312 from 6620, we get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Step 10:
When dividing 3080 by 789, we get 3 with a remainder of 713.
Put 3 as the next digit of the answer. 
Result so far: 91231.83
Deduct 2367 from 3080 and we're left with 713.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7130, and continue the process.

Advancing to step 11:
7130 divided by 789 is 9 with a remainder of 29.
Use 9 as the next digit of our solution. 
Result so far: 91231.839
Subtracting 7101 from 7130 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 12:
789 goes into 290 0 times with a remainder of 290.
Record the quotient 0 as the next digit in the result. 
Result so far: 91231.839
Subtracting 0 from 290 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 13:
789 goes into 2900 3 times with a remainder of 533.
Write down 3 as next digit of the result. 
Result so far: 91231.83903
Subtracting 2367 from 2900 leaves us with 533.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5330, and continue the process.

Moving on to step 14:
789 can be fit into 5330 6 times, resulting in a remainder of 596.
Write down 6 as next digit of the result. 
Result so far: 91231.839036
If we take 4734 away from 5330, we end up with 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Moving on to step 15:
When dividing 5960 by 789, we get 7 with a remainder of 437.
Put 7 as the next digit of the answer. 
Result so far: 91231.8390367
Subtract 5523 from 5960 to get 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

Moving on to step 16:
The number 789 fits into 4370 5 times, leaving a remainder of 425.
The next digit of our result is 5. 
Result so far: 91231.83903675
If we take 3945 away from 4370, we end up 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.

In conclusion, the division gives 91231.83903675 with a balance of 4.25e-07.