We divide 85459639 by 420
We want to divide 85459639 by 420.

On to step 1:
420 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 420

Step 2:
If we divide 85 by 420, we get 0 and a remainder of 85.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 85 and we're left with 85.
Grab the next digit (4) from the dividend, add it to 85, then carry on: 854 / 420

Step 3:
The number 420 fits into 854 2 times, leaving a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 14 after subtracting 840 from 854.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 420

Going ahead to step 4:
420 goes into 145 0 times with a remainder of 145.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
The remainder is 145 after subtracting 0 from 145.
Fetch the next digit (9) from the dividend, attach it to 145 and continue: 1459 / 420

Moving on to step 5:
The number 420 fits into 1459 3 times, leaving a remainder of 199.
Use 3 as the next digit of our solution. 
Result so far: 203.0
Subtract 1260 from 1459 to get 199.
Fetch the next digit (6) from the dividend, attach it to 199 and continue: 1996 / 420

Moving on to step 6:
When dividing 1996 by 420, we get 4 with a remainder of 316.
Record the quotient 4 as the next digit in the result. 
Result so far: 2034.0
Subtracting 1680 from 1996 leaves us with 316.
Append the next digit (3) from the dividend to 316 and continue with: 3163 / 420

Let's proceed to step 7:
If we divide 3163 by 420, we get 7 and a remainder of 223.
Write down 7 as next digit of the result. 
Result so far: 20347.0
If we subtract 2940 from 3163, we get 223.
Append the next digit (9) from the dividend to 223 and continue with: 2239 / 420

Going ahead to step 8:
The number 420 fits into 2239 5 times, leaving a remainder of 139.
Write down 5 as next digit of the result. 
Result so far: 203475.0
Subtracting 2100 from 2239 leaves us with 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

On to step 9:
420 goes into 1390 3 times with a remainder of 130.
Write down 3 as next digit of the result. 
Result so far: 203475.3
Subtract 1260 from 1390 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 10:
420 can be fit into 1300 3 times, resulting in a remainder of 40.
The next digit of our result is 3. 
Result so far: 203475.33
The remainder is 40 after subtracting 1260 from 1300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 203475.33, with a leftover of 0.04.