308474 ÷ 21 
We want to divide 308474 by 21.

On to step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 21

On to step 2:
When dividing 30 by 21, we get 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 9 after subtracting 21 from 30.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 21

Advancing to step 3:
98 divided by 21 is 4 with a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
If we subtract 84 from 98, we get 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 21

Let's proceed to step 4:
144 divided by 21 is 6 with a remainder of 18.
The next digit of our result is 6. 
Result so far: 146.0
If we subtract 126 from 144, we get 18.
Fetch the next digit (7) from the dividend, attach it to 18 and continue: 187 / 21

Advancing to step 5:
When dividing 187 by 21, we get 8 with a remainder of 19.
Record the quotient 8 as the next digit in the result. 
Result so far: 1468.0
If we subtract 168 from 187, we get 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 21

Moving on to step 6:
21 can be fit into 194 9 times, resulting in a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 14689.0
Subtracting 189 from 194 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
50 divided by 21 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 14689.2
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
When dividing 80 by 21, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 14689.23
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 9:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 14689.238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
When dividing 20 by 21, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 14689.238
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 11:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The next digit of our result is 9. 
Result so far: 14689.23809
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 12:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 14689.238095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 13:
If we divide 50 by 21, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 14689.2380952
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 14:
The number 21 fits into 80 3 times, leaving a remainder of 17.
The next digit of our result is 3. 
Result so far: 14689.23809523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Our division results in 14689.23809523 with a remaining 1.7e-08.