We look at the division of 42138185 by 858 
We want to figure out the number of times 42138185 can be divided by 858.

On to step 1:
858 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 858

Let's proceed to step 2:
42 divided by 858 is 0 with a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Include the next digit (1) from the dividend after 42, then repeat: 421 / 858

Advancing to step 3:
If we divide 421 by 858, we get 0 and a remainder of 421.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 421 after subtracting 0 from 421.
Take the next digit (3) from the dividend and append it to 421, then repeat: 4213 / 858

Moving on to step 4:
4213 divided by 858 is 4 with a remainder of 781.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 3432 from 4213 leaves us with 781.
Bring next digit (8) of the dividend behind the 781 and repeat the process: 7818 / 858

Going ahead to step 5:
858 goes into 7818 9 times with a remainder of 96.
Write down 9 as next digit of the result. 
Result so far: 49.0
Subtract 7722 from 7818 to get 96.
Take the next digit (1) from the dividend and append it to 96, then repeat: 961 / 858

Moving on to step 6:
858 can be fit into 961 1 times, resulting in a remainder of 103.
The next digit of our result is 1. 
Result so far: 491.0
If we take 858 away from 961, we end up with 103.
Append the next digit (8) from the dividend to 103 and continue with: 1038 / 858

Advancing to step 7:
If we divide 1038 by 858, we get 1 and a remainder of 180.
The next digit of our result is 1. 
Result so far: 4911.0
The remainder is 180 after subtracting 858 from 1038.
Bring next digit (5) of the dividend behind the 180 and repeat the process: 1805 / 858

Going ahead to step 8:
When dividing 1805 by 858, we get 2 with a remainder of 89.
Put 2 as the next digit of the answer. 
Result so far: 49112.0
If we subtract 1716 from 1805, we get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

On to step 9:
858 goes into 890 1 times with a remainder of 32.
Record the quotient 1 as the next digit in the result. 
Result so far: 49112.1
If we take 858 away from 890, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 10:
858 can be fit into 320 0 times, resulting in a remainder of 320.
Record the quotient 0 as the next digit in the result. 
Result so far: 49112.1
Deduct 0 from 320 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 11:
858 goes into 3200 3 times with a remainder of 626.
Write down 3 as next digit of the result. 
Result so far: 49112.103
If we take 2574 away from 3200, we end up with 626.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6260, and continue the process.

Step 12:
858 goes into 6260 7 times with a remainder of 254.
The next digit of our result is 7. 
Result so far: 49112.1037
If we take 6006 away from 6260, we end up with 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Advancing to step 13:
If we divide 2540 by 858, we get 2 and a remainder of 824.
Put 2 as the next digit of the answer. 
Result so far: 49112.10372
If we subtract 1716 from 2540, we get 824.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8240, and continue the process.

Step 14:
When dividing 8240 by 858, we get 9 with a remainder of 518.
The next digit of our result is 9. 
Result so far: 49112.103729
If we take 7722 away from 8240, we end up with 518.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

On to step 15:
5180 divided by 858 is 6 with a remainder of 32.
Write down 6 as next digit of the result. 
Result so far: 49112.1037296
The remainder is 32 after subtracting 5148 from 5180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 16:
320 divided by 858 is 0 with a remainder of 320.
Write down 0 as next digit of the result. 
Result so far: 49112.1037296
Subtracting 0 from 320 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

The quotient of the division is 49112.1037296, and the remainder is 3.2e-07.