99579 ÷ 20 
We want to figure out the number of times 99579 can be divided by 20.

Advancing to step 1:
9 divided by 20 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 20

Going ahead to step 2:
When dividing 99 by 20, we get 4 with a remainder of 19.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 80 away from 99, we end up with 19.
Take the next digit (5) from the dividend and append it to 19, then repeat: 195 / 20

Let's proceed to step 3:
20 can be fit into 195 9 times, resulting in a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 49.0
If we subtract 180 from 195, we get 15.
Bring next digit (7) of the dividend behind the 15 and repeat the process: 157 / 20

Advancing to step 4:
20 goes into 157 7 times with a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 497.0
The remainder is 17 after subtracting 140 from 157.
Fetch the next digit (9) from the dividend, attach it to 17 and continue: 179 / 20

Step 5:
179 divided by 20 is 8 with a remainder of 19.
Use 8 as the next digit of our solution. 
Result so far: 4978.0
The remainder is 19 after subtracting 160 from 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 6:
When dividing 190 by 20, we get 9 with a remainder of 10.
Put 9 as the next digit of the answer. 
Result so far: 4978.9
Subtracting 180 from 190 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
When dividing 100 by 20, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 4978.95
If we take 100 away from 100, 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.

On to step 8:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4978.95
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.

Step 9:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4978.95
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.

Our division results in 4978.95 with a remaining 0.0.