645490 ÷ 78 
Our goal is to divide 645490 by 78.

Moving on to step 1:
The number 78 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 78

Step 2:
If we divide 64 by 78, we get 0 and a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Bring next digit (5) of the dividend behind the 64 and repeat the process: 645 / 78

Let's proceed to step 3:
If we divide 645 by 78, we get 8 and a remainder of 21.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtracting 624 from 645 leaves us with 21.
Include the next digit (4) from the dividend after 21, then repeat: 214 / 78

On to step 4:
If we divide 214 by 78, we get 2 and a remainder of 58.
Put 2 as the next digit of the answer. 
Result so far: 82.0
Subtract 156 from 214 to get 58.
Bring next digit (9) of the dividend behind the 58 and repeat the process: 589 / 78

Going ahead to step 5:
78 can be fit into 589 7 times, resulting in a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 827.0
The remainder is 43 after subtracting 546 from 589.
Fetch the next digit (0) from the dividend, attach it to 43 and continue: 430 / 78

On to step 6:
The number 78 fits into 430 5 times, leaving a remainder of 40.
The next digit of our result is 5. 
Result so far: 8275.0
If we subtract 390 from 430, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 7:
If we divide 400 by 78, we get 5 and a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 8275.5
If we take 390 away from 400, we end up 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.

Advancing to step 8:
78 goes into 100 1 times with a remainder of 22.
Write down 1 as next digit of the result. 
Result so far: 8275.51
If we subtract 78 from 100, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 9:
78 can be fit into 220 2 times, resulting in a remainder of 64.
The next digit of our result is 2. 
Result so far: 8275.512
Subtracting 156 from 220 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 10:
78 goes into 640 8 times with a remainder of 16.
The next digit of our result is 8. 
Result so far: 8275.5128
Deduct 624 from 640 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 11:
160 divided by 78 is 2 with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 8275.51282
Subtracting 156 from 160 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
40 divided by 78 is 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 8275.51282
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 13:
78 goes into 400 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 8275.5128205
If we subtract 390 from 400, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 14:
When dividing 100 by 78, we get 1 with a remainder of 22.
Use 1 as the next digit of our solution. 
Result so far: 8275.51282051
Subtracting 78 from 100 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Our division results in 8275.51282051 with a remaining 2.2e-08.