We divide 78661584 by 80
We want to divide 78661584 by 80.

On to step 1:
When dividing 7 by 80, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 80

On to step 2:
If we divide 78 by 80, we get 0 and a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Append the next digit (6) from the dividend to 78 and continue with: 786 / 80

On to step 3:
When dividing 786 by 80, we get 9 with a remainder of 66.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtracting 720 from 786 leaves us with 66.
Grab the next digit (6) from the dividend, add it to 66, then carry on: 666 / 80

Going ahead to step 4:
The number 80 fits into 666 8 times, leaving a remainder of 26.
Put 8 as the next digit of the answer. 
Result so far: 98.0
Subtracting 640 from 666 leaves us with 26.
Take the next digit (1) from the dividend and append it to 26, then repeat: 261 / 80

Going ahead to step 5:
If we divide 261 by 80, we get 3 and a remainder of 21.
The number 3 becomes the next digit in our result. 
Result so far: 983.0
Subtract 240 from 261 to get 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 80

Going ahead to step 6:
The number 80 fits into 215 2 times, leaving a remainder of 55.
Record the quotient 2 as the next digit in the result. 
Result so far: 9832.0
Deduct 160 from 215 and we're left with 55.
Take the next digit (8) from the dividend and append it to 55, then repeat: 558 / 80

On to step 7:
When dividing 558 by 80, we get 6 with a remainder of 78.
The number 6 becomes the next digit in our result. 
Result so far: 98326.0
Subtracting 480 from 558 leaves us with 78.
Fetch the next digit (4) from the dividend, attach it to 78 and continue: 784 / 80

Going ahead to step 8:
When dividing 784 by 80, we get 9 with a remainder of 64.
Write down 9 as next digit of the result. 
Result so far: 983269.0
Subtract 720 from 784 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 9:
80 goes into 640 8 times with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 983269.8
Deduct 640 from 640 and we're left 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 10:
0 divided by 80 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 983269.8
Deduct 0 from 0 and we're left 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.

On to step 11:
80 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 983269.8
If we subtract 0 from 0, we 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 quotient of the division is 983269.8, and the remainder is 0.0.