Let's divide 878639 by 42
Let's see how many times 42 fits into 878639.

Moving on to step 1:
When dividing 8 by 42, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 42

Step 2:
When dividing 87 by 42, we get 2 with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 84 from 87, we get 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 42

Step 3:
The number 42 fits into 38 0 times, leaving a remainder of 38.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
Subtracting 0 from 38 leaves us with 38.
Bring next digit (6) of the dividend behind the 38 and repeat the process: 386 / 42

Advancing to step 4:
386 divided by 42 is 9 with a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 209.0
Deduct 378 from 386 and we're left with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 42

Let's proceed to step 5:
If we divide 83 by 42, we get 1 and a remainder of 41.
Record the quotient 1 as the next digit in the result. 
Result so far: 2091.0
Subtracting 42 from 83 leaves us with 41.
Take the next digit (9) from the dividend and append it to 41, then repeat: 419 / 42

Advancing to step 6:
The number 42 fits into 419 9 times, leaving a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 20919.0
Deduct 378 from 419 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 7:
410 divided by 42 is 9 with a remainder of 32.
The number 9 becomes the next digit in our result. 
Result so far: 20919.9
The remainder is 32 after subtracting 378 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 8:
If we divide 320 by 42, we get 7 and a remainder of 26.
The next digit of our result is 7. 
Result so far: 20919.97
Deduct 294 from 320 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 9:
260 divided by 42 is 6 with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 20919.976
Deduct 252 from 260 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
42 goes into 80 1 times with a remainder of 38.
Put 1 as the next digit of the answer. 
Result so far: 20919.9761
If we take 42 away from 80, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 11:
380 divided by 42 is 9 with a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 20919.97619
Subtracting 378 from 380 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
If we divide 20 by 42, we get 0 and a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 20919.97619
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 13:
When dividing 200 by 42, we get 4 with a remainder of 32.
Record the quotient 4 as the next digit in the result. 
Result so far: 20919.9761904
The remainder is 32 after subtracting 168 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 14:
42 goes into 320 7 times with a remainder of 26.
The next digit of our result is 7. 
Result so far: 20919.97619047
If we take 294 away from 320, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The final outcome is 20919.97619047, with a leftover of 2.6e-08.