80815021 divided by 425 
Let's see how many times 425 fits into 80815021.

Let's proceed to step 1:
425 can be fit into 8 0 times, resulting in a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 425

Let's proceed to step 2:
If we divide 80 by 425, we get 0 and a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 80 to get 80.
Append the next digit (8) from the dividend to 80 and continue with: 808 / 425

Advancing to step 3:
When dividing 808 by 425, we get 1 with a remainder of 383.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 425 away from 808, we end up with 383.
Fetch the next digit (1) from the dividend, attach it to 383 and continue: 3831 / 425

Let's proceed to step 4:
3831 divided by 425 is 9 with a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
If we subtract 3825 from 3831, we get 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 425

Let's proceed to step 5:
425 goes into 65 0 times with a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 190.0
Subtracting 0 from 65 leaves us with 65.
Take the next digit (0) from the dividend and append it to 65, then repeat: 650 / 425

Advancing to step 6:
425 can be fit into 650 1 times, resulting in a remainder of 225.
Use 1 as the next digit of our solution. 
Result so far: 1901.0
Deduct 425 from 650 and we're left with 225.
Bring next digit (2) of the dividend behind the 225 and repeat the process: 2252 / 425

On to step 7:
425 can be fit into 2252 5 times, resulting in a remainder of 127.
The number 5 becomes the next digit in our result. 
Result so far: 19015.0
If we take 2125 away from 2252, we end up with 127.
Append the next digit (1) from the dividend to 127 and continue with: 1271 / 425

On to step 8:
1271 divided by 425 is 2 with a remainder of 421.
The next digit of our result is 2. 
Result so far: 190152.0
Subtracting 850 from 1271 leaves us with 421.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4210, and continue the process.

Moving on to step 9:
When dividing 4210 by 425, we get 9 with a remainder of 385.
The next digit of our result is 9. 
Result so far: 190152.9
Deduct 3825 from 4210 and we're left with 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Going ahead to step 10:
3850 divided by 425 is 9 with a remainder of 25.
The number 9 becomes the next digit in our result. 
Result so far: 190152.99
Deduct 3825 from 3850 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final result is 190152.99 with a remainder of 0.025.