12390234 ÷ 542 
We want to figure out the number of times 12390234 can be divided by 542.

On to step 1:
542 can be fit into 1 0 times, resulting in a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 542

Let's proceed to step 2:
The number 542 fits into 12 0 times, leaving a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 542

On to step 3:
542 goes into 123 0 times with a remainder of 123.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 123 to get 123.
Bring next digit (9) of the dividend behind the 123 and repeat the process: 1239 / 542

Going ahead to step 4:
The number 542 fits into 1239 2 times, leaving a remainder of 155.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 1084 from 1239 and we're left with 155.
Grab the next digit (0) from the dividend, add it to 155, then carry on: 1550 / 542

Moving on to step 5:
1550 divided by 542 is 2 with a remainder of 466.
Use 2 as the next digit of our solution. 
Result so far: 22.0
If we subtract 1084 from 1550, we get 466.
Take the next digit (2) from the dividend and append it to 466, then repeat: 4662 / 542

Moving on to step 6:
4662 divided by 542 is 8 with a remainder of 326.
The next digit of our result is 8. 
Result so far: 228.0
Deduct 4336 from 4662 and we're left with 326.
Grab the next digit (3) from the dividend, add it to 326, then carry on: 3263 / 542

On to step 7:
542 can be fit into 3263 6 times, resulting in a remainder of 11.
The number 6 becomes the next digit in our result. 
Result so far: 2286.0
If we take 3252 away from 3263, we end up with 11.
Bring next digit (4) of the dividend behind the 11 and repeat the process: 114 / 542

Let's proceed to step 8:
114 divided by 542 is 0 with a remainder of 114.
The next digit of our result is 0. 
Result so far: 22860.0
Subtract 0 from 114 to get 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Let's proceed to step 9:
If we divide 1140 by 542, we get 2 and a remainder of 56.
Record the quotient 2 as the next digit in the result. 
Result so far: 22860.2
Subtracting 1084 from 1140 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 10:
560 divided by 542 is 1 with a remainder of 18.
The next digit of our result is 1. 
Result so far: 22860.21
Subtracting 542 from 560 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 11:
When dividing 180 by 542, we get 0 with a remainder of 180.
Write down 0 as next digit of the result. 
Result so far: 22860.21
The remainder is 180 after subtracting 0 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 12:
The number 542 fits into 1800 3 times, leaving a remainder of 174.
Record the quotient 3 as the next digit in the result. 
Result so far: 22860.2103
Subtract 1626 from 1800 to get 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

On to step 13:
542 goes into 1740 3 times with a remainder of 114.
Use 3 as the next digit of our solution. 
Result so far: 22860.21033
Subtracting 1626 from 1740 leaves us with 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

After the division, we end up with 22860.21033 and a remainder of 0.000114.