401665 ÷ 78 
Let's see how many times 78 fits into 401665.

Let's proceed to step 1:
4 divided by 78 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 78

Advancing to step 2:
78 can be fit into 40 0 times, resulting in a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Grab the next digit (1) from the dividend, add it to 40, then carry on: 401 / 78

Going ahead to step 3:
The number 78 fits into 401 5 times, leaving a remainder of 11.
The next digit of our result is 5. 
Result so far: 5.0
Deduct 390 from 401 and we're left with 11.
Include the next digit (6) from the dividend after 11, then repeat: 116 / 78

Let's proceed to step 4:
When dividing 116 by 78, we get 1 with a remainder of 38.
The next digit of our result is 1. 
Result so far: 51.0
If we take 78 away from 116, we end up with 38.
Grab the next digit (6) from the dividend, add it to 38, then carry on: 386 / 78

On to step 5:
The number 78 fits into 386 4 times, leaving a remainder of 74.
The next digit of our result is 4. 
Result so far: 514.0
The remainder is 74 after subtracting 312 from 386.
Fetch the next digit (5) from the dividend, attach it to 74 and continue: 745 / 78

Advancing to step 6:
If we divide 745 by 78, we get 9 and a remainder of 43.
Write down 9 as next digit of the result. 
Result so far: 5149.0
If we subtract 702 from 745, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 7:
When dividing 430 by 78, we get 5 with a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 5149.5
The remainder is 40 after subtracting 390 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
The number 78 fits into 400 5 times, leaving a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 5149.55
Deduct 390 from 400 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 5149.55, with a leftover of 0.01.