We look at the division of 430990 by 80 
We're looking to find how many times 80 goes into 430990.

Advancing to step 1:
80 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 80

Advancing to step 2:
The number 80 fits into 43 0 times, leaving a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 43 and we're left with 43.
Take the next digit (0) from the dividend and append it to 43, then repeat: 430 / 80

Going ahead to step 3:
The number 80 fits into 430 5 times, leaving a remainder of 30.
The next digit of our result is 5. 
Result so far: 5.0
Subtract 400 from 430 to get 30.
Take the next digit (9) from the dividend and append it to 30, then repeat: 309 / 80

Step 4:
When dividing 309 by 80, we get 3 with a remainder of 69.
Write down 3 as next digit of the result. 
Result so far: 53.0
The remainder is 69 after subtracting 240 from 309.
Grab the next digit (9) from the dividend, add it to 69, then carry on: 699 / 80

On to step 5:
699 divided by 80 is 8 with a remainder of 59.
Use 8 as the next digit of our solution. 
Result so far: 538.0
If we take 640 away from 699, we end up with 59.
Take the next digit (0) from the dividend and append it to 59, then repeat: 590 / 80

Advancing to step 6:
If we divide 590 by 80, we get 7 and a remainder of 30.
Use 7 as the next digit of our solution. 
Result so far: 5387.0
If we subtract 560 from 590, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 7:
When dividing 300 by 80, we get 3 with a remainder of 60.
Record the quotient 3 as the next digit in the result. 
Result so far: 5387.3
If we subtract 240 from 300, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 8:
The number 80 fits into 600 7 times, leaving a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 5387.37
Subtracting 560 from 600 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 9:
400 divided by 80 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 5387.375
Subtracting 400 from 400 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.

On to step 10:
When dividing 0 by 80, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5387.375
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.

On to step 11:
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: 5387.375
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.

The quotient of the division is 5387.375, and the remainder is 0.0.