Let's divide 85017178 by 420
We want to figure out the number of times 85017178 can be divided by 420.

Moving on to step 1:
8 divided by 420 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 420

Step 2:
420 goes into 85 0 times with a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 85, we get 85.
Bring next digit (0) of the dividend behind the 85 and repeat the process: 850 / 420

Going ahead to step 3:
If we divide 850 by 420, we get 2 and a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 840 from 850 leaves us with 10.
Grab the next digit (1) from the dividend, add it to 10, then carry on: 101 / 420

Step 4:
If we divide 101 by 420, we get 0 and a remainder of 101.
Use 0 as the next digit of our solution. 
Result so far: 20.0
The remainder is 101 after subtracting 0 from 101.
Include the next digit (7) from the dividend after 101, then repeat: 1017 / 420

Going ahead to step 5:
The number 420 fits into 1017 2 times, leaving a remainder of 177.
Write down 2 as next digit of the result. 
Result so far: 202.0
Deduct 840 from 1017 and we're left with 177.
Include the next digit (1) from the dividend after 177, then repeat: 1771 / 420

Going ahead to step 6:
If we divide 1771 by 420, we get 4 and a remainder of 91.
Record the quotient 4 as the next digit in the result. 
Result so far: 2024.0
The remainder is 91 after subtracting 1680 from 1771.
Bring next digit (7) of the dividend behind the 91 and repeat the process: 917 / 420

Moving on to step 7:
If we divide 917 by 420, we get 2 and a remainder of 77.
Use 2 as the next digit of our solution. 
Result so far: 20242.0
Deduct 840 from 917 and we're left with 77.
Include the next digit (8) from the dividend after 77, then repeat: 778 / 420

Going ahead to step 8:
420 can be fit into 778 1 times, resulting in a remainder of 358.
The next digit of our result is 1. 
Result so far: 202421.0
If we subtract 420 from 778, we get 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Moving on to step 9:
420 goes into 3580 8 times with a remainder of 220.
Put 8 as the next digit of the answer. 
Result so far: 202421.8
The remainder is 220 after subtracting 3360 from 3580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Let's proceed to step 10:
420 can be fit into 2200 5 times, resulting in a remainder of 100.
Record the quotient 5 as the next digit in the result. 
Result so far: 202421.85
Subtract 2100 from 2200 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 11:
420 can be fit into 1000 2 times, resulting in a remainder of 160.
Write down 2 as next digit of the result. 
Result so far: 202421.852
Deduct 840 from 1000 and we're left with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 12:
420 goes into 1600 3 times with a remainder of 340.
The next digit of our result is 3. 
Result so far: 202421.8523
If we take 1260 away from 1600, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Step 13:
The number 420 fits into 3400 8 times, leaving a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 202421.85238
Subtract 3360 from 3400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 14:
420 can be fit into 400 0 times, resulting in a remainder of 400.
Put 0 as the next digit of the answer. 
Result so far: 202421.85238
Subtracting 0 from 400 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

On to step 15:
420 can be fit into 4000 9 times, resulting in a remainder of 220.
The next digit of our result is 9. 
Result so far: 202421.8523809
The remainder is 220 after subtracting 3780 from 4000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 16:
If we divide 2200 by 420, we get 5 and a remainder of 100.
The number 5 becomes the next digit in our result. 
Result so far: 202421.85238095
Deduct 2100 from 2200 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final result is 202421.85238095 with a remainder of 1e-07.