We're dividing 80979160 by 521 
We want to figure out the number of times 80979160 can be divided by 521.

Step 1:
When dividing 8 by 521, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 521

On to step 2:
521 goes into 80 0 times with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 80 leaves us with 80.
Grab the next digit (9) from the dividend, add it to 80, then carry on: 809 / 521

Step 3:
The number 521 fits into 809 1 times, leaving a remainder of 288.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 521 from 809, we get 288.
Include the next digit (7) from the dividend after 288, then repeat: 2887 / 521

Step 4:
The number 521 fits into 2887 5 times, leaving a remainder of 282.
The next digit of our result is 5. 
Result so far: 15.0
Subtract 2605 from 2887 to get 282.
Fetch the next digit (9) from the dividend, attach it to 282 and continue: 2829 / 521

Moving on to step 5:
2829 divided by 521 is 5 with a remainder of 224.
The number 5 becomes the next digit in our result. 
Result so far: 155.0
Subtract 2605 from 2829 to get 224.
Append the next digit (1) from the dividend to 224 and continue with: 2241 / 521

Let's proceed to step 6:
The number 521 fits into 2241 4 times, leaving a remainder of 157.
Use 4 as the next digit of our solution. 
Result so far: 1554.0
Subtract 2084 from 2241 to get 157.
Append the next digit (6) from the dividend to 157 and continue with: 1576 / 521

Moving on to step 7:
The number 521 fits into 1576 3 times, leaving a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 15543.0
If we subtract 1563 from 1576, we get 13.
Bring next digit (0) of the dividend behind the 13 and repeat the process: 130 / 521

Let's proceed to step 8:
If we divide 130 by 521, we get 0 and a remainder of 130.
The number 0 becomes the next digit in our result. 
Result so far: 155430.0
Subtract 0 from 130 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Let's proceed to step 9:
1300 divided by 521 is 2 with a remainder of 258.
The next digit of our result is 2. 
Result so far: 155430.2
If we take 1042 away from 1300, we end up with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Step 10:
521 goes into 2580 4 times with a remainder of 496.
Write down 4 as next digit of the result. 
Result so far: 155430.24
The remainder is 496 after subtracting 2084 from 2580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Let's proceed to step 11:
521 can be fit into 4960 9 times, resulting in a remainder of 271.
Write down 9 as next digit of the result. 
Result so far: 155430.249
The remainder is 271 after subtracting 4689 from 4960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

Moving on to step 12:
521 goes into 2710 5 times with a remainder of 105.
Use 5 as the next digit of our solution. 
Result so far: 155430.2495
Subtracting 2605 from 2710 leaves us with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Let's proceed to step 13:
The number 521 fits into 1050 2 times, leaving a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 155430.24952
The remainder is 8 after subtracting 1042 from 1050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 14:
521 can be fit into 80 0 times, resulting in a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 155430.24952
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 15:
521 can be fit into 800 1 times, resulting in a remainder of 279.
The next digit of our result is 1. 
Result so far: 155430.2495201
Subtracting 521 from 800 leaves us with 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Step 16:
The number 521 fits into 2790 5 times, leaving a remainder of 185.
The number 5 becomes the next digit in our result. 
Result so far: 155430.24952015
If we take 2605 away from 2790, we end up with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

After the division, we end up with 155430.24952015 and a remainder of 1.85e-07.