Let's divide 835170 by 21
Let's see how many times 21 fits into 835170.

Moving on to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 21

Moving on to step 2:
If we divide 83 by 21, we get 3 and a remainder of 20.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 63 from 83, we get 20.
Grab the next digit (5) from the dividend, add it to 20, then carry on: 205 / 21

Going ahead to step 3:
205 divided by 21 is 9 with a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
Subtracting 189 from 205 leaves us with 16.
Include the next digit (1) from the dividend after 16, then repeat: 161 / 21

Going ahead to step 4:
21 goes into 161 7 times with a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 397.0
If we subtract 147 from 161, we get 14.
Include the next digit (7) from the dividend after 14, then repeat: 147 / 21

Let's proceed to step 5:
When dividing 147 by 21, we get 7 with a remainder of 0.
The next digit of our result is 7. 
Result so far: 3977.0
Subtracting 147 from 147 leaves us with 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 21

Advancing to step 6:
21 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 39770.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
The number 21 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 39770.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
If we divide 0 by 21, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 39770.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 39770.0 with a remaining 0.0.