We look at the division of 215409 by 585 
Our goal is to divide 215409 by 585.

Step 1:
The number 585 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 585

Advancing to step 2:
The number 585 fits into 21 0 times, leaving a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 585

Advancing to step 3:
If we divide 215 by 585, we get 0 and a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 215 leaves us with 215.
Append the next digit (4) from the dividend to 215 and continue with: 2154 / 585

Moving on to step 4:
If we divide 2154 by 585, we get 3 and a remainder of 399.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 399 after subtracting 1755 from 2154.
Bring next digit (0) of the dividend behind the 399 and repeat the process: 3990 / 585

Going ahead to step 5:
When dividing 3990 by 585, we get 6 with a remainder of 480.
The next digit of our result is 6. 
Result so far: 36.0
Deduct 3510 from 3990 and we're left with 480.
Include the next digit (9) from the dividend after 480, then repeat: 4809 / 585

Moving on to step 6:
If we divide 4809 by 585, we get 8 and a remainder of 129.
Put 8 as the next digit of the answer. 
Result so far: 368.0
Subtracting 4680 from 4809 leaves us with 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

On to step 7:
585 goes into 1290 2 times with a remainder of 120.
The next digit of our result is 2. 
Result so far: 368.2
Subtracting 1170 from 1290 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 8:
If we divide 1200 by 585, we get 2 and a remainder of 30.
The next digit of our result is 2. 
Result so far: 368.22
The remainder is 30 after subtracting 1170 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 368.22, with a leftover of 0.03.