We divide 342328 by 21
We're looking to find how many times 21 goes into 342328.

Going ahead to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 21

Let's proceed to step 2:
34 divided by 21 is 1 with a remainder of 13.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 21 away from 34, we end up with 13.
Append the next digit (2) from the dividend to 13 and continue with: 132 / 21

Advancing to step 3:
21 can be fit into 132 6 times, resulting in a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Deduct 126 from 132 and we're left with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 21

Going ahead to step 4:
63 divided by 21 is 3 with a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 163.0
If we subtract 63 from 63, we get 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 21

On to step 5:
If we divide 2 by 21, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 1630.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 21

Moving on to step 6:
The number 21 fits into 28 1 times, leaving a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 16301.0
If we subtract 21 from 28, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
If we divide 70 by 21, we get 3 and a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 16301.3
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 8:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 16301.33
If we subtract 63 from 70, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 16301.33 and a remainder of 0.007.