420573 ÷ 78 
We're looking to find how many times 78 goes into 420573.

Let's proceed to step 1:
78 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
If we subtract 0 from 4, we get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 78

On to step 2:
The number 78 fits into 42 0 times, leaving a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Include the next digit (0) from the dividend after 42, then repeat: 420 / 78

On to step 3:
78 goes into 420 5 times with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 390 away from 420, we end up with 30.
Fetch the next digit (5) from the dividend, attach it to 30 and continue: 305 / 78

Going ahead to step 4:
The number 78 fits into 305 3 times, leaving a remainder of 71.
Write down 3 as next digit of the result. 
Result so far: 53.0
Subtract 234 from 305 to get 71.
Fetch the next digit (7) from the dividend, attach it to 71 and continue: 717 / 78

Let's proceed to step 5:
78 can be fit into 717 9 times, resulting in a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 539.0
If we take 702 away from 717, we end up with 15.
Take the next digit (3) from the dividend and append it to 15, then repeat: 153 / 78

On to step 6:
If we divide 153 by 78, we get 1 and a remainder of 75.
The next digit of our result is 1. 
Result so far: 5391.0
Subtracting 78 from 153 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 7:
The number 78 fits into 750 9 times, leaving a remainder of 48.
The next digit of our result is 9. 
Result so far: 5391.9
Deduct 702 from 750 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 8:
If we divide 480 by 78, we get 6 and a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 5391.96
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.

Advancing to step 9:
78 goes into 120 1 times with a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 5391.961
If we subtract 78 from 120, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 10:
78 can be fit into 420 5 times, resulting in a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 5391.9615
If we subtract 390 from 420, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
When dividing 300 by 78, we get 3 with a remainder of 66.
The next digit of our result is 3. 
Result so far: 5391.96153
If we take 234 away from 300, we end up 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.

On to step 12:
660 divided by 78 is 8 with a remainder of 36.
Put 8 as the next digit of the answer. 
Result so far: 5391.961538
If we take 624 away from 660, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 13:
78 goes into 360 4 times with a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 5391.9615384
Subtracting 312 from 360 leaves us with 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 14:
78 goes into 480 6 times with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 5391.96153846
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.

After the division, we end up with 5391.96153846 and a remainder of 1.2e-08.