380888 divided by 21 
We want to figure out the number of times 380888 can be divided by 21.

Step 1:
21 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 21

Moving on to step 2:
21 goes into 38 1 times with a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 21 from 38, we get 17.
Take the next digit (0) from the dividend and append it to 17, then repeat: 170 / 21

Going ahead to step 3:
When dividing 170 by 21, we get 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 18.0
The remainder is 2 after subtracting 168 from 170.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 21

Advancing to step 4:
21 goes into 28 1 times with a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 181.0
Subtract 21 from 28 to get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 21

On to step 5:
21 can be fit into 78 3 times, resulting in a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 1813.0
Subtract 63 from 78 to get 15.
Grab the next digit (8) from the dividend, add it to 15, then carry on: 158 / 21

Moving on to step 6:
If we divide 158 by 21, we get 7 and a remainder of 11.
Use 7 as the next digit of our solution. 
Result so far: 18137.0
Subtracting 147 from 158 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.

Moving on to step 7:
When dividing 110 by 21, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 18137.5
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.

On to step 8:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 18137.52
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.

Advancing to step 9:
When dividing 80 by 21, we get 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 18137.523
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.

Going ahead to step 10:
When dividing 170 by 21, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 18137.5238
Subtracting 168 from 170 leaves us 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.

Advancing to step 11:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 18137.5238
If we subtract 0 from 20, we 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.

Going ahead to step 12:
If we divide 200 by 21, we get 9 and a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 18137.523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 13:
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: 18137.5238095
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 14:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 18137.52380952
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.

Our division results in 18137.52380952 with a remaining 8e-09.