We divide 80722861 by 645
Let's see how many times 645 fits into 80722861.

Going ahead to step 1:
645 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 645

Advancing to step 2:
645 goes into 80 0 times with a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 80 and we're left with 80.
Include the next digit (7) from the dividend after 80, then repeat: 807 / 645

Let's proceed to step 3:
If we divide 807 by 645, we get 1 and a remainder of 162.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 162 after subtracting 645 from 807.
Take the next digit (2) from the dividend and append it to 162, then repeat: 1622 / 645

Step 4:
When dividing 1622 by 645, we get 2 with a remainder of 332.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtracting 1290 from 1622 leaves us with 332.
Include the next digit (2) from the dividend after 332, then repeat: 3322 / 645

Moving on to step 5:
When dividing 3322 by 645, we get 5 with a remainder of 97.
Use 5 as the next digit of our solution. 
Result so far: 125.0
Subtracting 3225 from 3322 leaves us with 97.
Take the next digit (8) from the dividend and append it to 97, then repeat: 978 / 645

Going ahead to step 6:
When dividing 978 by 645, we get 1 with a remainder of 333.
Use 1 as the next digit of our solution. 
Result so far: 1251.0
If we take 645 away from 978, we end up with 333.
Include the next digit (6) from the dividend after 333, then repeat: 3336 / 645

Step 7:
645 can be fit into 3336 5 times, resulting in a remainder of 111.
Put 5 as the next digit of the answer. 
Result so far: 12515.0
If we subtract 3225 from 3336, we get 111.
Include the next digit (1) from the dividend after 111, then repeat: 1111 / 645

On to step 8:
When dividing 1111 by 645, we get 1 with a remainder of 466.
Record the quotient 1 as the next digit in the result. 
Result so far: 125151.0
If we take 645 away from 1111, we end up with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Step 9:
When dividing 4660 by 645, we get 7 with a remainder of 145.
The next digit of our result is 7. 
Result so far: 125151.7
If we take 4515 away from 4660, we end up with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Let's proceed to step 10:
1450 divided by 645 is 2 with a remainder of 160.
Write down 2 as next digit of the result. 
Result so far: 125151.72
Subtracting 1290 from 1450 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 11:
645 can be fit into 1600 2 times, resulting in a remainder of 310.
The next digit of our result is 2. 
Result so far: 125151.722
The remainder is 310 after subtracting 1290 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

The final outcome is 125151.722, with a leftover of 0.031.