We look at the division of 448421 by 85 
We want to figure out the number of times 448421 can be divided by 85.

Advancing to step 1:
4 divided by 85 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (4) from the dividend to 4 and continue with: 44 / 85

Step 2:
85 can be fit into 44 0 times, resulting in a remainder of 44.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 44, we get 44.
Grab the next digit (8) from the dividend, add it to 44, then carry on: 448 / 85

Going ahead to step 3:
If we divide 448 by 85, we get 5 and a remainder of 23.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 425 away from 448, we end up with 23.
Take the next digit (4) from the dividend and append it to 23, then repeat: 234 / 85

Moving on to step 4:
85 goes into 234 2 times with a remainder of 64.
The next digit of our result is 2. 
Result so far: 52.0
Deduct 170 from 234 and we're left with 64.
Append the next digit (2) from the dividend to 64 and continue with: 642 / 85

On to step 5:
642 divided by 85 is 7 with a remainder of 47.
Write down 7 as next digit of the result. 
Result so far: 527.0
The remainder is 47 after subtracting 595 from 642.
Append the next digit (1) from the dividend to 47 and continue with: 471 / 85

Let's proceed to step 6:
The number 85 fits into 471 5 times, leaving a remainder of 46.
Record the quotient 5 as the next digit in the result. 
Result so far: 5275.0
If we subtract 425 from 471, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 7:
If we divide 460 by 85, we get 5 and a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 5275.5
Deduct 425 from 460 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 8:
85 can be fit into 350 4 times, resulting in a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 5275.54
If we take 340 away from 350, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
85 can be fit into 100 1 times, resulting in a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 5275.541
Subtracting 85 from 100 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.

Let's proceed to step 10:
The number 85 fits into 150 1 times, leaving a remainder of 65.
The next digit of our result is 1. 
Result so far: 5275.5411
If we take 85 away from 150, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

After the division, we end up with 5275.5411 and a remainder of 0.00065.