300660 ÷ 78 
We're looking to find how many times 78 goes into 300660.

Step 1:
The number 78 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 78

Advancing to step 2:
If we divide 30 by 78, we get 0 and a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 30 and we're left with 30.
Grab the next digit (0) from the dividend, add it to 30, then carry on: 300 / 78

Going ahead to step 3:
The number 78 fits into 300 3 times, leaving a remainder of 66.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 234 from 300, we get 66.
Take the next digit (6) from the dividend and append it to 66, then repeat: 666 / 78

Let's proceed to step 4:
78 can be fit into 666 8 times, resulting in a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
The remainder is 42 after subtracting 624 from 666.
Bring next digit (6) of the dividend behind the 42 and repeat the process: 426 / 78

Going ahead to step 5:
426 divided by 78 is 5 with a remainder of 36.
Use 5 as the next digit of our solution. 
Result so far: 385.0
If we subtract 390 from 426, we get 36.
Take the next digit (0) from the dividend and append it to 36, then repeat: 360 / 78

Step 6:
78 can be fit into 360 4 times, resulting in a remainder of 48.
Put 4 as the next digit of the answer. 
Result so far: 3854.0
If we subtract 312 from 360, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 7:
When dividing 480 by 78, we get 6 with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 3854.6
If we subtract 468 from 480, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
78 can be fit into 120 1 times, resulting in a remainder of 42.
The number 1 becomes the next digit in our result. 
Result so far: 3854.61
Deduct 78 from 120 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 9:
78 goes into 420 5 times with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 3854.615
Subtracting 390 from 420 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 10:
78 can be fit into 300 3 times, resulting in a remainder of 66.
Use 3 as the next digit of our solution. 
Result so far: 3854.6153
Subtracting 234 from 300 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 11:
If we divide 660 by 78, we get 8 and a remainder of 36.
The next digit of our result is 8. 
Result so far: 3854.61538
The remainder is 36 after subtracting 624 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 12:
If we divide 360 by 78, we get 4 and a remainder of 48.
The number 4 becomes the next digit in our result. 
Result so far: 3854.615384
If we subtract 312 from 360, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 13:
If we divide 480 by 78, we get 6 and a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 3854.6153846
Subtract 468 from 480 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 14:
If we divide 120 by 78, we get 1 and a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 3854.61538461
The remainder is 42 after subtracting 78 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Our division results in 3854.61538461 with a remaining 4.2e-08.