We divide 379589 by 21
We're looking to find how many times 21 goes into 379589.

Step 1:
When dividing 3 by 21, we get 0 with 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.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 21

Step 2:
When dividing 37 by 21, we get 1 with a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 21 away from 37, we end up with 16.
Append the next digit (9) from the dividend to 16 and continue with: 169 / 21

On to step 3:
169 divided by 21 is 8 with a remainder of 1.
The next digit of our result is 8. 
Result so far: 18.0
If we take 168 away from 169, we end up with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 21

On to step 4:
21 goes into 15 0 times with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 180.0
Subtract 0 from 15 to get 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 21

Moving on to step 5:
158 divided by 21 is 7 with a remainder of 11.
Put 7 as the next digit of the answer. 
Result so far: 1807.0
Subtracting 147 from 158 leaves us with 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 21

Moving on to step 6:
When dividing 119 by 21, we get 5 with a remainder of 14.
Put 5 as the next digit of the answer. 
Result so far: 18075.0
Subtracting 105 from 119 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
The number 21 fits into 140 6 times, leaving a remainder of 14.
The next digit of our result is 6. 
Result so far: 18075.6
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.

On to step 8:
If we divide 140 by 21, we get 6 and a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 18075.66
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.

The final outcome is 18075.66, with a leftover of 0.014.