We're dividing 854925 by 21 
We want to figure out the number of times 854925 can be divided by 21.

Let's proceed to step 1:
8 divided by 21 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 21

Going ahead to step 2:
21 can be fit into 85 4 times, resulting in a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 84 from 85 leaves us with 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 21

Advancing to step 3:
21 goes into 14 0 times with a remainder of 14.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
If we take 0 away from 14, we end up with 14.
Include the next digit (9) from the dividend after 14, then repeat: 149 / 21

Let's proceed to step 4:
149 divided by 21 is 7 with a remainder of 2.
The next digit of our result is 7. 
Result so far: 407.0
If we subtract 147 from 149, we get 2.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 21

Let's proceed to step 5:
21 goes into 22 1 times with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 4071.0
If we subtract 21 from 22, we get 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 21

Let's proceed to step 6:
If we divide 15 by 21, we get 0 and a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 40710.0
If we subtract 0 from 15, 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.

Let's proceed to step 7:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 40710.7
If we take 147 away from 150, we end up 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.

On to step 8:
30 divided by 21 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 40710.71
If we take 21 away from 30, we end up 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.

Let's proceed to step 9:
When dividing 90 by 21, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 40710.714
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.

Moving on to step 10:
When dividing 60 by 21, we get 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 40710.7142
If we subtract 42 from 60, we get 18.
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 11:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 40710.71428
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 12:
When dividing 120 by 21, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 40710.714285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 13:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 40710.7142857
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 14:
If we divide 30 by 21, we get 1 and a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 40710.71428571
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.

The final result is 40710.71428571 with a remainder of 9e-09.