We divide 521521 by 80
We want to divide 521521 by 80.

Moving on to step 1:
The number 80 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 80

Advancing to step 2:
80 can be fit into 52 0 times, resulting in a remainder of 52.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Grab the next digit (1) from the dividend, add it to 52, then carry on: 521 / 80

Let's proceed to step 3:
80 can be fit into 521 6 times, resulting in a remainder of 41.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Deduct 480 from 521 and we're left with 41.
Bring next digit (5) of the dividend behind the 41 and repeat the process: 415 / 80

Going ahead to step 4:
The number 80 fits into 415 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 65.0
Subtract 400 from 415 to get 15.
Append the next digit (2) from the dividend to 15 and continue with: 152 / 80

On to step 5:
When dividing 152 by 80, we get 1 with a remainder of 72.
The number 1 becomes the next digit in our result. 
Result so far: 651.0
Subtracting 80 from 152 leaves us with 72.
Include the next digit (1) from the dividend after 72, then repeat: 721 / 80

Moving on to step 6:
The number 80 fits into 721 9 times, leaving a remainder of 1.
The next digit of our result is 9. 
Result so far: 6519.0
If we subtract 720 from 721, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
If we divide 10 by 80, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 6519.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
80 goes into 100 1 times with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 6519.01
If we subtract 80 from 100, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
When dividing 200 by 80, we get 2 with a remainder of 40.
The next digit of our result is 2. 
Result so far: 6519.012
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.

Let's proceed to step 10:
400 divided by 80 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 6519.0125
Deduct 400 from 400 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.

Moving on to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6519.0125
If we take 0 away from 0, we end up 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.

Step 12:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 6519.0125
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 6519.0125 with a balance of 0.0.