We look at the division of 768243 by 42 
We want to figure out the number of times 768243 can be divided by 42.

Advancing to step 1:
7 divided by 42 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Append the next digit (6) from the dividend to 7 and continue with: 76 / 42

Going ahead to step 2:
42 can be fit into 76 1 times, resulting in a remainder of 34.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 42 from 76 leaves us with 34.
Append the next digit (8) from the dividend to 34 and continue with: 348 / 42

Advancing to step 3:
348 divided by 42 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 18.0
The remainder is 12 after subtracting 336 from 348.
Grab the next digit (2) from the dividend, add it to 12, then carry on: 122 / 42

Let's proceed to step 4:
When dividing 122 by 42, we get 2 with a remainder of 38.
The next digit of our result is 2. 
Result so far: 182.0
Subtract 84 from 122 to get 38.
Grab the next digit (4) from the dividend, add it to 38, then carry on: 384 / 42

Advancing to step 5:
42 goes into 384 9 times with a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 1829.0
Subtract 378 from 384 to get 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 42

Going ahead to step 6:
When dividing 63 by 42, we get 1 with a remainder of 21.
Use 1 as the next digit of our solution. 
Result so far: 18291.0
Deduct 42 from 63 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 7:
42 goes into 210 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 18291.5
Deduct 210 from 210 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
42 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 18291.5
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
42 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 18291.5
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 18291.5 with a remainder of 0.0.