415212 divided by 21 
We want to divide 415212 by 21.

Moving on to step 1:
21 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (1) from the dividend and append it to 4, then repeat: 41 / 21

Going ahead to step 2:
The number 21 fits into 41 1 times, leaving a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 20 after subtracting 21 from 41.
Bring next digit (5) of the dividend behind the 20 and repeat the process: 205 / 21

Advancing to step 3:
When dividing 205 by 21, we get 9 with a remainder of 16.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we subtract 189 from 205, we get 16.
Append the next digit (2) from the dividend to 16 and continue with: 162 / 21

Let's proceed to step 4:
21 goes into 162 7 times with a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 197.0
If we take 147 away from 162, we end up with 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 21

Let's proceed to step 5:
The number 21 fits into 151 7 times, leaving a remainder of 4.
The next digit of our result is 7. 
Result so far: 1977.0
Subtract 147 from 151 to get 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 21

On to step 6:
21 goes into 42 2 times with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 19772.0
Subtracting 42 from 42 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.

Going ahead to step 7:
21 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 19772.0
If we take 0 away from 0, we end up 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.

Let's proceed to step 8:
When dividing 0 by 21, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 19772.0
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.

The quotient of the division is 19772.0, and the remainder is 0.0.