858021 divided by 45 
We want to divide 858021 by 45.

On to step 1:
45 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 45

Let's proceed to step 2:
45 goes into 85 1 times with a remainder of 40.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 45 away from 85, we end up with 40.
Include the next digit (8) from the dividend after 40, then repeat: 408 / 45

Advancing to step 3:
If we divide 408 by 45, we get 9 and a remainder of 3.
The next digit of our result is 9. 
Result so far: 19.0
Deduct 405 from 408 and we're left with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 45

Moving on to step 4:
45 goes into 30 0 times with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 190.0
The remainder is 30 after subtracting 0 from 30.
Grab the next digit (2) from the dividend, add it to 30, then carry on: 302 / 45

Let's proceed to step 5:
302 divided by 45 is 6 with a remainder of 32.
The number 6 becomes the next digit in our result. 
Result so far: 1906.0
The remainder is 32 after subtracting 270 from 302.
Append the next digit (1) from the dividend to 32 and continue with: 321 / 45

Step 6:
45 can be fit into 321 7 times, resulting in a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 19067.0
Subtract 315 from 321 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.

Going ahead to step 7:
If we divide 60 by 45, we get 1 and a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 19067.1
If we subtract 45 from 60, 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.

Moving on to step 8:
When dividing 150 by 45, we get 3 with a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 19067.13
If we subtract 135 from 150, 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.

Advancing to step 9:
If we divide 150 by 45, we get 3 and a remainder of 15.
The next digit of our result is 3. 
Result so far: 19067.133
Subtract 135 from 150 to 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.

The quotient of the division is 19067.133, and the remainder is 0.0015.