80907441 ÷ 645 
We're looking to find how many times 645 goes into 80907441.

On to step 1:
The number 645 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 645

On to step 2:
80 divided by 645 is 0 with a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Fetch the next digit (9) from the dividend, attach it to 80 and continue: 809 / 645

Moving on to step 3:
If we divide 809 by 645, we get 1 and a remainder of 164.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 645 from 809 leaves us with 164.
Include the next digit (0) from the dividend after 164, then repeat: 1640 / 645

Advancing to step 4:
645 can be fit into 1640 2 times, resulting in a remainder of 350.
The next digit of our result is 2. 
Result so far: 12.0
Deduct 1290 from 1640 and we're left with 350.
Bring next digit (7) of the dividend behind the 350 and repeat the process: 3507 / 645

Going ahead to step 5:
645 goes into 3507 5 times with a remainder of 282.
Record the quotient 5 as the next digit in the result. 
Result so far: 125.0
If we take 3225 away from 3507, we end up with 282.
Include the next digit (4) from the dividend after 282, then repeat: 2824 / 645

On to step 6:
The number 645 fits into 2824 4 times, leaving a remainder of 244.
Put 4 as the next digit of the answer. 
Result so far: 1254.0
Subtracting 2580 from 2824 leaves us with 244.
Include the next digit (4) from the dividend after 244, then repeat: 2444 / 645

Going ahead to step 7:
When dividing 2444 by 645, we get 3 with a remainder of 509.
Put 3 as the next digit of the answer. 
Result so far: 12543.0
Subtract 1935 from 2444 to get 509.
Fetch the next digit (1) from the dividend, attach it to 509 and continue: 5091 / 645

Going ahead to step 8:
The number 645 fits into 5091 7 times, leaving a remainder of 576.
The number 7 becomes the next digit in our result. 
Result so far: 125437.0
Subtracting 4515 from 5091 leaves us with 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

On to step 9:
645 can be fit into 5760 8 times, resulting in a remainder of 600.
Record the quotient 8 as the next digit in the result. 
Result so far: 125437.8
If we take 5160 away from 5760, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Let's proceed to step 10:
6000 divided by 645 is 9 with a remainder of 195.
The next digit of our result is 9. 
Result so far: 125437.89
Subtract 5805 from 6000 to get 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Step 11:
645 can be fit into 1950 3 times, resulting in a remainder of 15.
The next digit of our result is 3. 
Result so far: 125437.893
The remainder is 15 after subtracting 1935 from 1950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 12:
150 divided by 645 is 0 with a remainder of 150.
The next digit of our result is 0. 
Result so far: 125437.893
Subtracting 0 from 150 leaves us with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Let's proceed to step 13:
1500 divided by 645 is 2 with a remainder of 210.
The number 2 becomes the next digit in our result. 
Result so far: 125437.89302
Deduct 1290 from 1500 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Let's proceed to step 14:
If we divide 2100 by 645, we get 3 and a remainder of 165.
The number 3 becomes the next digit in our result. 
Result so far: 125437.893023
If we take 1935 away from 2100, we end up with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Going ahead to step 15:
The number 645 fits into 1650 2 times, leaving a remainder of 360.
Write down 2 as next digit of the result. 
Result so far: 125437.8930232
Subtract 1290 from 1650 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 16:
The number 645 fits into 3600 5 times, leaving a remainder of 375.
Put 5 as the next digit of the answer. 
Result so far: 125437.89302325
The remainder is 375 after subtracting 3225 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

In conclusion, the division gives 125437.89302325 with a balance of 3.75e-07.