We look at the division of 302365 by 21 
We want to divide 302365 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 take 0 away from 3, we end up with 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 21

Let's proceed to step 2:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 9 after subtracting 21 from 30.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 21

Step 3:
When dividing 92 by 21, we get 4 with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
The remainder is 8 after subtracting 84 from 92.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 21

Step 4:
If we divide 83 by 21, we get 3 and a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 143.0
The remainder is 20 after subtracting 63 from 83.
Grab the next digit (6) from the dividend, add it to 20, then carry on: 206 / 21

Going ahead to step 5:
206 divided by 21 is 9 with a remainder of 17.
Write down 9 as next digit of the result. 
Result so far: 1439.0
The remainder is 17 after subtracting 189 from 206.
Grab the next digit (5) from the dividend, add it to 17, then carry on: 175 / 21

Advancing to step 6:
The number 21 fits into 175 8 times, leaving a remainder of 7.
Record the quotient 8 as the next digit in the result. 
Result so far: 14398.0
Deduct 168 from 175 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 14398.3
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
If we divide 70 by 21, we get 3 and a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 14398.33
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 14398.33 and a remainder of 0.007.