123021 divided by 78 
Let's see how many times 78 fits into 123021.

On to step 1:
When dividing 1 by 78, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 78

Going ahead to step 2:
If we divide 12 by 78, we get 0 and a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 78

Step 3:
If we divide 123 by 78, we get 1 and a remainder of 45.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 78 from 123, we get 45.
Fetch the next digit (0) from the dividend, attach it to 45 and continue: 450 / 78

Moving on to step 4:
450 divided by 78 is 5 with a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we take 390 away from 450, we end up with 60.
Include the next digit (2) from the dividend after 60, then repeat: 602 / 78

Step 5:
78 goes into 602 7 times with a remainder of 56.
Record the quotient 7 as the next digit in the result. 
Result so far: 157.0
Deduct 546 from 602 and we're left with 56.
Take the next digit (1) from the dividend and append it to 56, then repeat: 561 / 78

Going ahead to step 6:
78 can be fit into 561 7 times, resulting in a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 1577.0
Subtracting 546 from 561 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 7:
When dividing 150 by 78, we get 1 with a remainder of 72.
The number 1 becomes the next digit in our result. 
Result so far: 1577.1
Subtract 78 from 150 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 8:
78 can be fit into 720 9 times, resulting in a remainder of 18.
Use 9 as the next digit of our solution. 
Result so far: 1577.19
Subtract 702 from 720 to get 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 9:
78 goes into 180 2 times with a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 1577.192
Deduct 156 from 180 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 10:
240 divided by 78 is 3 with a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 1577.1923
Deduct 234 from 240 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
78 goes into 60 0 times with a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 1577.1923
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 12:
78 can be fit into 600 7 times, resulting in a remainder of 54.
The number 7 becomes the next digit in our result. 
Result so far: 1577.192307
If we subtract 546 from 600, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 13:
If we divide 540 by 78, we get 6 and a remainder of 72.
Put 6 as the next digit of the answer. 
Result so far: 1577.1923076
If we subtract 468 from 540, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 14:
78 goes into 720 9 times with a remainder of 18.
Use 9 as the next digit of our solution. 
Result so far: 1577.19230769
The remainder is 18 after subtracting 702 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final outcome is 1577.19230769, with a leftover of 1.8e-08.