We look at the division of 301978 by 21 
Let's see how many times 21 fits into 301978.

Advancing to step 1:
3 divided by 21 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 21

Going ahead to step 2:
If we divide 30 by 21, we get 1 and a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 21 away from 30, we end up with 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 21

Going ahead to step 3:
The number 21 fits into 91 4 times, leaving a remainder of 7.
Put 4 as the next digit of the answer. 
Result so far: 14.0
Subtract 84 from 91 to get 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 21

On to step 4:
79 divided by 21 is 3 with a remainder of 16.
The number 3 becomes the next digit in our result. 
Result so far: 143.0
Subtract 63 from 79 to get 16.
Grab the next digit (7) from the dividend, add it to 16, then carry on: 167 / 21

Advancing to step 5:
21 can be fit into 167 7 times, resulting in a remainder of 20.
The next digit of our result is 7. 
Result so far: 1437.0
Subtracting 147 from 167 leaves us with 20.
Take the next digit (8) from the dividend and append it to 20, then repeat: 208 / 21

Advancing to step 6:
If we divide 208 by 21, we get 9 and a remainder of 19.
Write down 9 as next digit of the result. 
Result so far: 14379.0
Deduct 189 from 208 and we're left 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.

Advancing to step 7:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 14379.9
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 8:
The number 21 fits into 10 0 times, leaving a remainder of 10.
The next digit of our result is 0. 
Result so far: 14379.9
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 9:
When dividing 100 by 21, we get 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 14379.904
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.

Advancing to step 10:
21 goes into 160 7 times with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 14379.9047
If we take 147 away from 160, we end up 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 11:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 14379.90476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
If we divide 40 by 21, we get 1 and a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 14379.904761
Subtract 21 from 40 to 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.

Let's proceed to step 13:
When dividing 190 by 21, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 14379.9047619
If we subtract 189 from 190, we get 1.
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 14:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 14379.9047619
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 14379.9047619 with a remainder of 1e-08.