We divide 42400 by 77
We're looking to find how many times 77 goes into 42400.

Going ahead to step 1:
77 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 77

Advancing to step 2:
When dividing 42 by 77, we get 0 with a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Include the next digit (4) from the dividend after 42, then repeat: 424 / 77

On to step 3:
77 can be fit into 424 5 times, resulting in a remainder of 39.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtracting 385 from 424 leaves us with 39.
Fetch the next digit (0) from the dividend, attach it to 39 and continue: 390 / 77

On to step 4:
When dividing 390 by 77, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 55.0
If we subtract 385 from 390, we get 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 77

Let's proceed to step 5:
50 divided by 77 is 0 with a remainder of 50.
The next digit of our result is 0. 
Result so far: 550.0
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 6:
77 can be fit into 500 6 times, resulting in a remainder of 38.
Use 6 as the next digit of our solution. 
Result so far: 550.6
The remainder is 38 after subtracting 462 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 7:
When dividing 380 by 77, we get 4 with a remainder of 72.
Use 4 as the next digit of our solution. 
Result so far: 550.64
If we subtract 308 from 380, 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.

Let's proceed to step 8:
77 can be fit into 720 9 times, resulting in a remainder of 27.
The next digit of our result is 9. 
Result so far: 550.649
Subtracting 693 from 720 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 9:
The number 77 fits into 270 3 times, leaving a remainder of 39.
Write down 3 as next digit of the result. 
Result so far: 550.6493
If we subtract 231 from 270, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 10:
77 can be fit into 390 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 550.64935
If we take 385 away from 390, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 11:
The number 77 fits into 50 0 times, leaving a remainder of 50.
The next digit of our result is 0. 
Result so far: 550.64935
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 12:
77 can be fit into 500 6 times, resulting in a remainder of 38.
Put 6 as the next digit of the answer. 
Result so far: 550.6493506
If we take 462 away from 500, 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.

Moving on to step 13:
77 goes into 380 4 times with a remainder of 72.
The number 4 becomes the next digit in our result. 
Result so far: 550.64935064
If we take 308 away from 380, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final result is 550.64935064 with a remainder of 7.2e-08.