363304 ÷ 21 
Our goal is to divide 363304 by 21.

Step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 21

Moving on to step 2:
The number 21 fits into 36 1 times, leaving a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 21 from 36 to get 15.
Append the next digit (3) from the dividend to 15 and continue with: 153 / 21

Going ahead to step 3:
When dividing 153 by 21, we get 7 with a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Subtracting 147 from 153 leaves us with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 21

Advancing to step 4:
21 can be fit into 63 3 times, resulting in a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 173.0
Subtracting 63 from 63 leaves us with 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 21

Moving on to step 5:
21 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1730.0
Subtract 0 from 0 to get 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 21

Moving on to step 6:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 17300.0
Subtract 0 from 4 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
21 can be fit into 40 1 times, resulting in a remainder of 19.
The next digit of our result is 1. 
Result so far: 17300.1
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 8:
190 divided by 21 is 9 with a remainder of 1.
The next digit of our result is 9. 
Result so far: 17300.19
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 9:
If we divide 10 by 21, we get 0 and a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 17300.19
If we take 0 away from 10, we end up 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.

Going ahead to step 10:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 17300.1904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 11:
When dividing 160 by 21, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 17300.19047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 12:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 17300.190476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 13:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 17300.1904761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 14:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 17300.19047619
If we take 189 away from 190, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Our division results in 17300.19047619 with a remaining 1e-09.