300419 divided by 21 
We want to divide 300419 by 21.

Advancing to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 21

On to step 2:
21 can be fit into 30 1 times, resulting in 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.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 21

Let's proceed to step 3:
90 divided by 21 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Deduct 84 from 90 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 21

Advancing to step 4:
The number 21 fits into 64 3 times, leaving a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 143.0
If we take 63 away from 64, we end up with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 21

Step 5:
21 can be fit into 11 0 times, resulting in a remainder of 11.
Record the quotient 0 as the next digit in the result. 
Result so far: 1430.0
If we subtract 0 from 11, we get 11.
Include the next digit (9) from the dividend after 11, then repeat: 119 / 21

Going ahead to step 6:
When dividing 119 by 21, we get 5 with a remainder of 14.
Record the quotient 5 as the next digit in the result. 
Result so far: 14305.0
Subtract 105 from 119 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 7:
140 divided by 21 is 6 with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 14305.6
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
140 divided by 21 is 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 14305.66
If we subtract 126 from 140, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 14305.66 with a remainder of 0.014.