We're dividing 73089007 by 645 
Let's see how many times 645 fits into 73089007.

Moving on to step 1:
If we divide 7 by 645, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Bring next digit (3) of the dividend behind the 7 and repeat the process: 73 / 645

Advancing to step 2:
645 can be fit into 73 0 times, resulting in a remainder of 73.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 73 to get 73.
Fetch the next digit (0) from the dividend, attach it to 73 and continue: 730 / 645

Advancing to step 3:
The number 645 fits into 730 1 times, leaving a remainder of 85.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 645 away from 730, we end up with 85.
Grab the next digit (8) from the dividend, add it to 85, then carry on: 858 / 645

Let's proceed to step 4:
858 divided by 645 is 1 with a remainder of 213.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
The remainder is 213 after subtracting 645 from 858.
Bring next digit (9) of the dividend behind the 213 and repeat the process: 2139 / 645

Moving on to step 5:
645 can be fit into 2139 3 times, resulting in a remainder of 204.
Put 3 as the next digit of the answer. 
Result so far: 113.0
If we take 1935 away from 2139, we end up with 204.
Fetch the next digit (0) from the dividend, attach it to 204 and continue: 2040 / 645

Advancing to step 6:
645 can be fit into 2040 3 times, resulting in a remainder of 105.
The number 3 becomes the next digit in our result. 
Result so far: 1133.0
Subtracting 1935 from 2040 leaves us with 105.
Bring next digit (0) of the dividend behind the 105 and repeat the process: 1050 / 645

Advancing to step 7:
645 goes into 1050 1 times with a remainder of 405.
The number 1 becomes the next digit in our result. 
Result so far: 11331.0
The remainder is 405 after subtracting 645 from 1050.
Append the next digit (7) from the dividend to 405 and continue with: 4057 / 645

Advancing to step 8:
The number 645 fits into 4057 6 times, leaving a remainder of 187.
Put 6 as the next digit of the answer. 
Result so far: 113316.0
Subtract 3870 from 4057 to get 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Step 9:
645 can be fit into 1870 2 times, resulting in a remainder of 580.
Use 2 as the next digit of our solution. 
Result so far: 113316.2
If we take 1290 away from 1870, we end up with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Moving on to step 10:
If we divide 5800 by 645, we get 8 and a remainder of 640.
Put 8 as the next digit of the answer. 
Result so far: 113316.28
Deduct 5160 from 5800 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Advancing to step 11:
645 goes into 6400 9 times with a remainder of 595.
The next digit of our result is 9. 
Result so far: 113316.289
The remainder is 595 after subtracting 5805 from 6400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Let's proceed to step 12:
The number 645 fits into 5950 9 times, leaving a remainder of 145.
The number 9 becomes the next digit in our result. 
Result so far: 113316.2899
If we take 5805 away from 5950, 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.

After the division, we end up with 113316.2899 and a remainder of 0.00145.