376304 ÷ 21 
We're looking to find how many times 21 goes into 376304.

Moving on to step 1:
When dividing 3 by 21, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 21

Let's proceed to step 2:
21 goes into 37 1 times with a remainder of 16.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 21 away from 37, we end up with 16.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 21

Going ahead to step 3:
When dividing 166 by 21, we get 7 with a remainder of 19.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
If we subtract 147 from 166, we get 19.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 21

Step 4:
21 can be fit into 193 9 times, resulting in a remainder of 4.
Put 9 as the next digit of the answer. 
Result so far: 179.0
The remainder is 4 after subtracting 189 from 193.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 21

Step 5:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1791.0
The remainder is 19 after subtracting 21 from 40.
Grab the next digit (4) from the dividend, add it to 19, then carry on: 194 / 21

Advancing to step 6:
When dividing 194 by 21, we get 9 with a remainder of 5.
Write down 9 as next digit of the result. 
Result so far: 17919.0
If we take 189 away from 194, 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 7:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 17919.2
Deduct 42 from 50 and we're left 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.

On 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: 17919.23
If we take 63 away from 80, we end up 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.

Going ahead to step 9:
21 goes into 170 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 17919.238
The remainder is 2 after subtracting 168 from 170.
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:
21 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 17919.238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 17919.23809
The remainder is 11 after subtracting 189 from 200.
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 number 5 becomes the next digit in our result. 
Result so far: 17919.238095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 13:
If we divide 50 by 21, we get 2 and a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 17919.2380952
If we take 42 away from 50, we end up 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.

Let's proceed to step 14:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 17919.23809523
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.

In conclusion, the division gives 17919.23809523 with a balance of 1.7e-08.