Let's divide 317583 by 21
We want to figure out the number of times 317583 can be divided by 21.

Moving on to step 1:
3 divided by 21 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 21

Step 2:
The number 21 fits into 31 1 times, leaving a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 21 from 31 to get 10.
Bring next digit (7) of the dividend behind the 10 and repeat the process: 107 / 21

Step 3:
The number 21 fits into 107 5 times, leaving a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtracting 105 from 107 leaves us with 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 21

Step 4:
If we divide 25 by 21, we get 1 and a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 151.0
Deduct 21 from 25 and we're left with 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 21

Advancing to step 5:
48 divided by 21 is 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 1512.0
Deduct 42 from 48 and we're left with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 21

Step 6:
When dividing 63 by 21, we get 3 with a remainder of 0.
The next digit of our result is 3. 
Result so far: 15123.0
Subtract 63 from 63 to get 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 7:
The number 21 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 15123.0
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.

Advancing to step 8:
0 divided by 21 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 15123.0
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 15123.0 with a remaining 0.0.