Let's divide 352488 by 21
We want to divide 352488 by 21.

On to step 1:
3 divided by 21 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 21

On to step 2:
35 divided by 21 is 1 with a remainder of 14.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 21 from 35 and we're left with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 21

On to step 3:
142 divided by 21 is 6 with a remainder of 16.
Use 6 as the next digit of our solution. 
Result so far: 16.0
The remainder is 16 after subtracting 126 from 142.
Fetch the next digit (4) from the dividend, attach it to 16 and continue: 164 / 21

Let's proceed to step 4:
The number 21 fits into 164 7 times, leaving a remainder of 17.
Write down 7 as next digit of the result. 
Result so far: 167.0
The remainder is 17 after subtracting 147 from 164.
Bring next digit (8) of the dividend behind the 17 and repeat the process: 178 / 21

Let's proceed to step 5:
The number 21 fits into 178 8 times, leaving a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 1678.0
Subtracting 168 from 178 leaves us with 10.
Take the next digit (8) from the dividend and append it to 10, then repeat: 108 / 21

Step 6:
108 divided by 21 is 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 16785.0
Subtracting 105 from 108 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
21 goes into 30 1 times with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 16785.1
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 8:
21 can be fit into 90 4 times, resulting in a remainder of 6.
The next digit of our result is 4. 
Result so far: 16785.14
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 16785.142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 10:
21 goes into 180 8 times with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 16785.1428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 11:
If we divide 120 by 21, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 16785.14285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 12:
When dividing 150 by 21, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 16785.142857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
21 goes into 30 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 16785.1428571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 14:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 16785.14285714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Our division results in 16785.14285714 with a remaining 6e-09.