We look at the division of 42166159 by 642 
We want to divide 42166159 by 642.

Moving on to step 1:
If we divide 4 by 642, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 642

Advancing to step 2:
When dividing 42 by 642, we get 0 with a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Bring next digit (1) of the dividend behind the 42 and repeat the process: 421 / 642

Let's proceed to step 3:
642 goes into 421 0 times with a remainder of 421.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 421 after subtracting 0 from 421.
Bring next digit (6) of the dividend behind the 421 and repeat the process: 4216 / 642

On to step 4:
The number 642 fits into 4216 6 times, leaving a remainder of 364.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtracting 3852 from 4216 leaves us with 364.
Append the next digit (6) from the dividend to 364 and continue with: 3646 / 642

Step 5:
When dividing 3646 by 642, we get 5 with a remainder of 436.
The number 5 becomes the next digit in our result. 
Result so far: 65.0
Subtracting 3210 from 3646 leaves us with 436.
Grab the next digit (1) from the dividend, add it to 436, then carry on: 4361 / 642

Advancing to step 6:
If we divide 4361 by 642, we get 6 and a remainder of 509.
Put 6 as the next digit of the answer. 
Result so far: 656.0
Subtract 3852 from 4361 to get 509.
Take the next digit (5) from the dividend and append it to 509, then repeat: 5095 / 642

On to step 7:
The number 642 fits into 5095 7 times, leaving a remainder of 601.
The next digit of our result is 7. 
Result so far: 6567.0
Subtracting 4494 from 5095 leaves us with 601.
Append the next digit (9) from the dividend to 601 and continue with: 6019 / 642

On to step 8:
642 can be fit into 6019 9 times, resulting in a remainder of 241.
Put 9 as the next digit of the answer. 
Result so far: 65679.0
Subtract 5778 from 6019 to get 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Going ahead to step 9:
2410 divided by 642 is 3 with a remainder of 484.
The next digit of our result is 3. 
Result so far: 65679.3
The remainder is 484 after subtracting 1926 from 2410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Advancing to step 10:
If we divide 4840 by 642, we get 7 and a remainder of 346.
The next digit of our result is 7. 
Result so far: 65679.37
The remainder is 346 after subtracting 4494 from 4840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Step 11:
When dividing 3460 by 642, we get 5 with a remainder of 250.
The number 5 becomes the next digit in our result. 
Result so far: 65679.375
The remainder is 250 after subtracting 3210 from 3460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Moving on to step 12:
642 goes into 2500 3 times with a remainder of 574.
The number 3 becomes the next digit in our result. 
Result so far: 65679.3753
Deduct 1926 from 2500 and we're left with 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

Going ahead to step 13:
If we divide 5740 by 642, we get 8 and a remainder of 604.
The next digit of our result is 8. 
Result so far: 65679.37538
If we subtract 5136 from 5740, we get 604.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6040, and continue the process.

Advancing to step 14:
6040 divided by 642 is 9 with a remainder of 262.
Write down 9 as next digit of the result. 
Result so far: 65679.375389
Subtracting 5778 from 6040 leaves us with 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Let's proceed to step 15:
2620 divided by 642 is 4 with a remainder of 52.
The next digit of our result is 4. 
Result so far: 65679.3753894
Subtract 2568 from 2620 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 16:
If we divide 520 by 642, we get 0 and a remainder of 520.
Record the quotient 0 as the next digit in the result. 
Result so far: 65679.3753894
The remainder is 520 after subtracting 0 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

After the division, we end up with 65679.3753894 and a remainder of 5.2e-07.