We divide 303618 by 21
We want to figure out the number of times 303618 can be divided by 21.

Step 1:
3 divided by 21 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 21

Advancing to step 2:
If we divide 30 by 21, we get 1 and a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 21 away from 30, we end up with 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 21

Going ahead to step 3:
If we divide 93 by 21, we get 4 and a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
If we subtract 84 from 93, we get 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 21

Moving on to step 4:
If we divide 96 by 21, we get 4 and a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 144.0
If we subtract 84 from 96, we get 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 21

Step 5:
The number 21 fits into 121 5 times, leaving a remainder of 16.
The number 5 becomes the next digit in our result. 
Result so far: 1445.0
Subtract 105 from 121 to get 16.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 21

Advancing to step 6:
If we divide 168 by 21, we get 8 and a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 14458.0
The remainder is 0 after subtracting 168 from 168.
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 7:
21 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 14458.0
If we subtract 0 from 0, we 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.

On to step 8:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 14458.0
Subtract 0 from 0 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.

The quotient of the division is 14458.0, and the remainder is 0.0.