85835670 ÷ 420 
We want to figure out the number of times 85835670 can be divided by 420.

Step 1:
The number 420 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 420

Step 2:
The number 420 fits into 85 0 times, leaving a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 85 leaves us with 85.
Include the next digit (8) from the dividend after 85, then repeat: 858 / 420

On to step 3:
If we divide 858 by 420, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 840 from 858 and we're left with 18.
Take the next digit (3) from the dividend and append it to 18, then repeat: 183 / 420

Moving on to step 4:
When dividing 183 by 420, we get 0 with a remainder of 183.
Write down 0 as next digit of the result. 
Result so far: 20.0
Subtract 0 from 183 to get 183.
Bring next digit (5) of the dividend behind the 183 and repeat the process: 1835 / 420

Let's proceed to step 5:
When dividing 1835 by 420, we get 4 with a remainder of 155.
Use 4 as the next digit of our solution. 
Result so far: 204.0
If we take 1680 away from 1835, we end up with 155.
Include the next digit (6) from the dividend after 155, then repeat: 1556 / 420

Going ahead to step 6:
When dividing 1556 by 420, we get 3 with a remainder of 296.
The number 3 becomes the next digit in our result. 
Result so far: 2043.0
If we take 1260 away from 1556, we end up with 296.
Grab the next digit (7) from the dividend, add it to 296, then carry on: 2967 / 420

Going ahead to step 7:
420 can be fit into 2967 7 times, resulting in a remainder of 27.
Put 7 as the next digit of the answer. 
Result so far: 20437.0
Deduct 2940 from 2967 and we're left with 27.
Include the next digit (0) from the dividend after 27, then repeat: 270 / 420

Advancing to step 8:
If we divide 270 by 420, we get 0 and a remainder of 270.
Put 0 as the next digit of the answer. 
Result so far: 204370.0
If we subtract 0 from 270, we get 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Advancing to step 9:
2700 divided by 420 is 6 with a remainder of 180.
Put 6 as the next digit of the answer. 
Result so far: 204370.6
Deduct 2520 from 2700 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

On to step 10:
420 can be fit into 1800 4 times, resulting in a remainder of 120.
The next digit of our result is 4. 
Result so far: 204370.64
Subtract 1680 from 1800 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 11:
When dividing 1200 by 420, we get 2 with a remainder of 360.
Use 2 as the next digit of our solution. 
Result so far: 204370.642
The remainder is 360 after subtracting 840 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 12:
If we divide 3600 by 420, we get 8 and a remainder of 240.
The number 8 becomes the next digit in our result. 
Result so far: 204370.6428
The remainder is 240 after subtracting 3360 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 13:
The number 420 fits into 2400 5 times, leaving a remainder of 300.
Put 5 as the next digit of the answer. 
Result so far: 204370.64285
If we subtract 2100 from 2400, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 14:
3000 divided by 420 is 7 with a remainder of 60.
Put 7 as the next digit of the answer. 
Result so far: 204370.642857
If we subtract 2940 from 3000, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 15:
600 divided by 420 is 1 with a remainder of 180.
Record the quotient 1 as the next digit in the result. 
Result so far: 204370.6428571
If we subtract 420 from 600, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Step 16:
1800 divided by 420 is 4 with a remainder of 120.
Record the quotient 4 as the next digit in the result. 
Result so far: 204370.64285714
Subtracting 1680 from 1800 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

The quotient of the division is 204370.64285714, and the remainder is 1.2e-07.