We look at the division of 664378 by 84 
We want to figure out the number of times 664378 can be divided by 84.

Step 1:
6 divided by 84 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 84

Moving on to step 2:
When dividing 66 by 84, we get 0 with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Grab the next digit (4) from the dividend, add it to 66, then carry on: 664 / 84

Going ahead to step 3:
When dividing 664 by 84, we get 7 with a remainder of 76.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we take 588 away from 664, we end up with 76.
Append the next digit (3) from the dividend to 76 and continue with: 763 / 84

Moving on to step 4:
The number 84 fits into 763 9 times, leaving a remainder of 7.
The next digit of our result is 9. 
Result so far: 79.0
If we subtract 756 from 763, we get 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 84

Let's proceed to step 5:
When dividing 77 by 84, we get 0 with a remainder of 77.
Use 0 as the next digit of our solution. 
Result so far: 790.0
Subtracting 0 from 77 leaves us with 77.
Include the next digit (8) from the dividend after 77, then repeat: 778 / 84

Let's proceed to step 6:
The number 84 fits into 778 9 times, leaving a remainder of 22.
Put 9 as the next digit of the answer. 
Result so far: 7909.0
If we subtract 756 from 778, 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.

Going ahead to step 7:
When dividing 220 by 84, we get 2 with a remainder of 52.
Write down 2 as next digit of the result. 
Result so far: 7909.2
If we take 168 away from 220, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 8:
84 can be fit into 520 6 times, resulting in a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 7909.26
Subtract 504 from 520 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.

Going ahead to step 9:
84 can be fit into 160 1 times, resulting in a remainder of 76.
The next digit of our result is 1. 
Result so far: 7909.261
If we subtract 84 from 160, we get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 10:
When dividing 760 by 84, we get 9 with a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 7909.2619
The remainder is 4 after subtracting 756 from 760.
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 11:
84 can be fit into 40 0 times, resulting in a remainder of 40.
The next digit of our result is 0. 
Result so far: 7909.2619
If we take 0 away from 40, we end up 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 12:
When dividing 400 by 84, we get 4 with a remainder of 64.
The number 4 becomes the next digit in our result. 
Result so far: 7909.261904
If we take 336 away from 400, we end up 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.

Advancing to step 13:
84 can be fit into 640 7 times, resulting in a remainder of 52.
Use 7 as the next digit of our solution. 
Result so far: 7909.2619047
Deduct 588 from 640 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 14:
84 goes into 520 6 times with a remainder of 16.
Write down 6 as next digit of the result. 
Result so far: 7909.26190476
Subtracting 504 from 520 leaves us 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.

The final outcome is 7909.26190476, with a leftover of 1.6e-08.