666598 divided by 78 
We want to figure out the number of times 666598 can be divided by 78.

Advancing to step 1:
The number 78 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 78

Advancing to step 2:
When dividing 66 by 78, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Grab the next digit (6) from the dividend, add it to 66, then carry on: 666 / 78

Advancing to step 3:
If we divide 666 by 78, we get 8 and a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 624 away from 666, we end up with 42.
Grab the next digit (5) from the dividend, add it to 42, then carry on: 425 / 78

On to step 4:
425 divided by 78 is 5 with a remainder of 35.
The next digit of our result is 5. 
Result so far: 85.0
Deduct 390 from 425 and we're left with 35.
Fetch the next digit (9) from the dividend, attach it to 35 and continue: 359 / 78

Let's proceed to step 5:
78 goes into 359 4 times with a remainder of 47.
Use 4 as the next digit of our solution. 
Result so far: 854.0
If we subtract 312 from 359, we get 47.
Grab the next digit (8) from the dividend, add it to 47, then carry on: 478 / 78

Going ahead to step 6:
If we divide 478 by 78, we get 6 and a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 8546.0
If we subtract 468 from 478, 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.

On to step 7:
78 goes into 100 1 times with a remainder of 22.
Record the quotient 1 as the next digit in the result. 
Result so far: 8546.1
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.

Let's proceed to step 8:
78 goes into 220 2 times with a remainder of 64.
The number 2 becomes the next digit in our result. 
Result so far: 8546.12
Subtract 156 from 220 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 9:
The number 78 fits into 640 8 times, leaving a remainder of 16.
The next digit of our result is 8. 
Result so far: 8546.128
Subtract 624 from 640 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 10:
The number 78 fits into 160 2 times, leaving a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 8546.1282
Subtract 156 from 160 to get 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 11:
If we divide 40 by 78, we get 0 and a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 8546.1282
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.

Advancing to step 12:
400 divided by 78 is 5 with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 8546.128205
The remainder is 10 after subtracting 390 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 13:
78 can be fit into 100 1 times, resulting in a remainder of 22.
Put 1 as the next digit of the answer. 
Result so far: 8546.1282051
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 14:
When dividing 220 by 78, we get 2 with a remainder of 64.
Use 2 as the next digit of our solution. 
Result so far: 8546.12820512
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.

The final outcome is 8546.12820512, with a leftover of 6.4e-08.