We look at the division of 669373 by 78 
We want to divide 669373 by 78.

On to step 1:
When dividing 6 by 78, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 78

On to step 2:
66 divided by 78 is 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Take the next digit (9) from the dividend and append it to 66, then repeat: 669 / 78

Let's proceed to step 3:
78 can be fit into 669 8 times, resulting in a remainder of 45.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 624 away from 669, we end up with 45.
Grab the next digit (3) from the dividend, add it to 45, then carry on: 453 / 78

Moving on to step 4:
78 goes into 453 5 times with a remainder of 63.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
If we subtract 390 from 453, we get 63.
Include the next digit (7) from the dividend after 63, then repeat: 637 / 78

Step 5:
78 goes into 637 8 times with a remainder of 13.
The number 8 becomes the next digit in our result. 
Result so far: 858.0
Subtract 624 from 637 to get 13.
Append the next digit (3) from the dividend to 13 and continue with: 133 / 78

Going ahead to step 6:
78 can be fit into 133 1 times, resulting in a remainder of 55.
The number 1 becomes the next digit in our result. 
Result so far: 8581.0
The remainder is 55 after subtracting 78 from 133.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 7:
If we divide 550 by 78, we get 7 and a remainder of 4.
The next digit of our result is 7. 
Result so far: 8581.7
Deduct 546 from 550 and we're left 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.

Advancing to step 8:
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: 8581.7
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 9:
If we divide 400 by 78, we get 5 and a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 8581.705
Subtract 390 from 400 to 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.

On to step 10:
78 can be fit into 100 1 times, resulting in a remainder of 22.
The number 1 becomes the next digit in our result. 
Result so far: 8581.7051
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.

Advancing to step 11:
The number 78 fits into 220 2 times, leaving a remainder of 64.
Write down 2 as next digit of the result. 
Result so far: 8581.70512
Deduct 156 from 220 and we're left 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.

Step 12:
640 divided by 78 is 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 8581.705128
The remainder is 16 after subtracting 624 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 13:
The number 78 fits into 160 2 times, leaving a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 8581.7051282
The remainder is 4 after subtracting 156 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 14:
78 goes into 40 0 times with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 8581.7051282
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.

The quotient of the division is 8581.7051282, and the remainder is 4e-08.