We look at the division of 357112 by 21 
Let's see how many times 21 fits into 357112.

Let's proceed to 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
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 21

On to step 2:
When dividing 35 by 21, we get 1 with a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 21 away from 35, we end up with 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 21

Step 3:
When dividing 147 by 21, we get 7 with a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 147 from 147, we get 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 21

Going ahead to step 4:
When dividing 1 by 21, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 170.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 21

Let's proceed to step 5:
21 can be fit into 11 0 times, resulting in a remainder of 11.
Record the quotient 0 as the next digit in the result. 
Result so far: 1700.0
If we subtract 0 from 11, we get 11.
Bring next digit (2) of the dividend behind the 11 and repeat the process: 112 / 21

Let's proceed to step 6:
If we divide 112 by 21, we get 5 and a remainder of 7.
Record the quotient 5 as the next digit in the result. 
Result so far: 17005.0
If we subtract 105 from 112, 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.

Moving on to step 7:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 17005.3
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.

On to step 8:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 17005.33
Subtracting 63 from 70 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Our division results in 17005.33 with a remaining 0.007.