Let's divide 42085781 by 820
We want to figure out the number of times 42085781 can be divided by 820.

Step 1:
The number 820 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 820

On to step 2:
42 divided by 820 is 0 with a remainder of 42.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Fetch the next digit (0) from the dividend, attach it to 42 and continue: 420 / 820

Let's proceed to step 3:
The number 820 fits into 420 0 times, leaving a remainder of 420.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 420 leaves us with 420.
Bring next digit (8) of the dividend behind the 420 and repeat the process: 4208 / 820

Going ahead to step 4:
820 can be fit into 4208 5 times, resulting in a remainder of 108.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 4100 from 4208, we get 108.
Bring next digit (5) of the dividend behind the 108 and repeat the process: 1085 / 820

Advancing to step 5:
820 goes into 1085 1 times with a remainder of 265.
Write down 1 as next digit of the result. 
Result so far: 51.0
Deduct 820 from 1085 and we're left with 265.
Fetch the next digit (7) from the dividend, attach it to 265 and continue: 2657 / 820

On to step 6:
820 can be fit into 2657 3 times, resulting in a remainder of 197.
Write down 3 as next digit of the result. 
Result so far: 513.0
Subtract 2460 from 2657 to get 197.
Include the next digit (8) from the dividend after 197, then repeat: 1978 / 820

Moving on to step 7:
If we divide 1978 by 820, we get 2 and a remainder of 338.
Put 2 as the next digit of the answer. 
Result so far: 5132.0
If we take 1640 away from 1978, we end up with 338.
Fetch the next digit (1) from the dividend, attach it to 338 and continue: 3381 / 820

Going ahead to step 8:
If we divide 3381 by 820, we get 4 and a remainder of 101.
The number 4 becomes the next digit in our result. 
Result so far: 51324.0
Deduct 3280 from 3381 and we're left with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Advancing to step 9:
The number 820 fits into 1010 1 times, leaving a remainder of 190.
Write down 1 as next digit of the result. 
Result so far: 51324.1
If we take 820 away from 1010, we end up with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Let's proceed to step 10:
820 can be fit into 1900 2 times, resulting in a remainder of 260.
Use 2 as the next digit of our solution. 
Result so far: 51324.12
If we subtract 1640 from 1900, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 11:
2600 divided by 820 is 3 with a remainder of 140.
The next digit of our result is 3. 
Result so far: 51324.123
Subtracting 2460 from 2600 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 12:
820 goes into 1400 1 times with a remainder of 580.
Record the quotient 1 as the next digit in the result. 
Result so far: 51324.1231
If we subtract 820 from 1400, we get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

On to step 13:
When dividing 5800 by 820, we get 7 with a remainder of 60.
Put 7 as the next digit of the answer. 
Result so far: 51324.12317
Deduct 5740 from 5800 and we're left with 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 14:
When dividing 600 by 820, we get 0 with a remainder of 600.
Record the quotient 0 as the next digit in the result. 
Result so far: 51324.12317
Subtract 0 from 600 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

On to step 15:
820 goes into 6000 7 times with a remainder of 260.
Record the quotient 7 as the next digit in the result. 
Result so far: 51324.1231707
Deduct 5740 from 6000 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 16:
820 can be fit into 2600 3 times, resulting in a remainder of 140.
Put 3 as the next digit of the answer. 
Result so far: 51324.12317073
Subtract 2460 from 2600 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

In conclusion, the division gives 51324.12317073 with a balance of 1.4e-07.