73878769 divided by 80 
Let's see how many times 80 fits into 73878769.

On to step 1:
The number 80 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (3) from the dividend, add it to 7, then carry on: 73 / 80

Moving on to step 2:
When dividing 73 by 80, we get 0 with a remainder of 73.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 73, we get 73.
Bring next digit (8) of the dividend behind the 73 and repeat the process: 738 / 80

Going ahead to step 3:
When dividing 738 by 80, we get 9 with a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we take 720 away from 738, we end up with 18.
Take the next digit (7) from the dividend and append it to 18, then repeat: 187 / 80

On to step 4:
187 divided by 80 is 2 with a remainder of 27.
Put 2 as the next digit of the answer. 
Result so far: 92.0
If we take 160 away from 187, we end up with 27.
Bring next digit (8) of the dividend behind the 27 and repeat the process: 278 / 80

On to step 5:
The number 80 fits into 278 3 times, leaving a remainder of 38.
The next digit of our result is 3. 
Result so far: 923.0
If we subtract 240 from 278, we get 38.
Take the next digit (7) from the dividend and append it to 38, then repeat: 387 / 80

Moving on to step 6:
80 goes into 387 4 times with a remainder of 67.
The next digit of our result is 4. 
Result so far: 9234.0
If we subtract 320 from 387, we get 67.
Include the next digit (6) from the dividend after 67, then repeat: 676 / 80

On to step 7:
80 can be fit into 676 8 times, resulting in a remainder of 36.
The next digit of our result is 8. 
Result so far: 92348.0
If we subtract 640 from 676, we get 36.
Fetch the next digit (9) from the dividend, attach it to 36 and continue: 369 / 80

Advancing to step 8:
80 can be fit into 369 4 times, resulting in a remainder of 49.
The next digit of our result is 4. 
Result so far: 923484.0
The remainder is 49 after subtracting 320 from 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 9:
80 goes into 490 6 times with a remainder of 10.
The next digit of our result is 6. 
Result so far: 923484.6
Deduct 480 from 490 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
When dividing 100 by 80, we get 1 with a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 923484.61
Subtracting 80 from 100 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 11:
80 can be fit into 200 2 times, resulting in a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 923484.612
The remainder is 40 after subtracting 160 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 12:
80 can be fit into 400 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 923484.6125
Subtract 400 from 400 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 13:
When dividing 0 by 80, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 923484.6125
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 14:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 923484.6125
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 923484.6125 with a remainder of 0.0.