640472 ÷ 78 
Our goal is to divide 640472 by 78.

Going ahead to step 1:
The number 78 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 78

Let's proceed to step 2:
The number 78 fits into 64 0 times, leaving a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Include the next digit (0) from the dividend after 64, then repeat: 640 / 78

Going ahead to step 3:
78 can be fit into 640 8 times, resulting in a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 624 from 640, we get 16.
Grab the next digit (4) from the dividend, add it to 16, then carry on: 164 / 78

Moving on to step 4:
78 can be fit into 164 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 82.0
Subtract 156 from 164 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 78

Advancing to step 5:
78 goes into 87 1 times with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 821.0
If we take 78 away from 87, we end up with 9.
Fetch the next digit (2) from the dividend, attach it to 9 and continue: 92 / 78

Step 6:
When dividing 92 by 78, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 8211.0
The remainder is 14 after subtracting 78 from 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 7:
The number 78 fits into 140 1 times, leaving a remainder of 62.
The next digit of our result is 1. 
Result so far: 8211.1
Subtracting 78 from 140 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 8:
The number 78 fits into 620 7 times, leaving a remainder of 74.
The next digit of our result is 7. 
Result so far: 8211.17
If we take 546 away from 620, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 9:
78 goes into 740 9 times with a remainder of 38.
The next digit of our result is 9. 
Result so far: 8211.179
If we take 702 away from 740, 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.

On to step 10:
When dividing 380 by 78, we get 4 with a remainder of 68.
Write down 4 as next digit of the result. 
Result so far: 8211.1794
Subtracting 312 from 380 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 11:
The number 78 fits into 680 8 times, leaving a remainder of 56.
The next digit of our result is 8. 
Result so far: 8211.17948
Subtract 624 from 680 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 12:
78 goes into 560 7 times with a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 8211.179487
The remainder is 14 after subtracting 546 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 13:
140 divided by 78 is 1 with a remainder of 62.
The next digit of our result is 1. 
Result so far: 8211.1794871
Subtract 78 from 140 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 14:
78 goes into 620 7 times with a remainder of 74.
Put 7 as the next digit of the answer. 
Result so far: 8211.17948717
Subtract 546 from 620 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

The final result is 8211.17948717 with a remainder of 7.4e-08.