We're dividing 78306280 by 643 
We want to figure out the number of times 78306280 can be divided by 643.

On to step 1:
643 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 643

On to step 2:
If we divide 78 by 643, we get 0 and a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Bring next digit (3) of the dividend behind the 78 and repeat the process: 783 / 643

On to step 3:
643 can be fit into 783 1 times, resulting in a remainder of 140.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 643 from 783 to get 140.
Take the next digit (0) from the dividend and append it to 140, then repeat: 1400 / 643

Step 4:
When dividing 1400 by 643, we get 2 with a remainder of 114.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we subtract 1286 from 1400, we get 114.
Bring next digit (6) of the dividend behind the 114 and repeat the process: 1146 / 643

Step 5:
When dividing 1146 by 643, we get 1 with a remainder of 503.
The number 1 becomes the next digit in our result. 
Result so far: 121.0
If we subtract 643 from 1146, we get 503.
Fetch the next digit (2) from the dividend, attach it to 503 and continue: 5032 / 643

Going ahead to step 6:
When dividing 5032 by 643, we get 7 with a remainder of 531.
Record the quotient 7 as the next digit in the result. 
Result so far: 1217.0
The remainder is 531 after subtracting 4501 from 5032.
Include the next digit (8) from the dividend after 531, then repeat: 5318 / 643

Let's proceed to step 7:
If we divide 5318 by 643, we get 8 and a remainder of 174.
Use 8 as the next digit of our solution. 
Result so far: 12178.0
Subtracting 5144 from 5318 leaves us with 174.
Include the next digit (0) from the dividend after 174, then repeat: 1740 / 643

Advancing to step 8:
643 goes into 1740 2 times with a remainder of 454.
Record the quotient 2 as the next digit in the result. 
Result so far: 121782.0
If we subtract 1286 from 1740, we get 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

On to step 9:
The number 643 fits into 4540 7 times, leaving a remainder of 39.
Put 7 as the next digit of the answer. 
Result so far: 121782.7
Deduct 4501 from 4540 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 10:
643 goes into 390 0 times with a remainder of 390.
Put 0 as the next digit of the answer. 
Result so far: 121782.7
If we take 0 away from 390, we end up with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Advancing to step 11:
643 can be fit into 3900 6 times, resulting in a remainder of 42.
Record the quotient 6 as the next digit in the result. 
Result so far: 121782.706
If we take 3858 away from 3900, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 12:
The number 643 fits into 420 0 times, leaving a remainder of 420.
Write down 0 as next digit of the result. 
Result so far: 121782.706
If we subtract 0 from 420, we get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Let's proceed to step 13:
If we divide 4200 by 643, we get 6 and a remainder of 342.
The number 6 becomes the next digit in our result. 
Result so far: 121782.70606
Subtracting 3858 from 4200 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Moving on to step 14:
643 goes into 3420 5 times with a remainder of 205.
Put 5 as the next digit of the answer. 
Result so far: 121782.706065
If we subtract 3215 from 3420, we get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Moving on to step 15:
643 can be fit into 2050 3 times, resulting in a remainder of 121.
The next digit of our result is 3. 
Result so far: 121782.7060653
The remainder is 121 after subtracting 1929 from 2050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

On to step 16:
When dividing 1210 by 643, we get 1 with a remainder of 567.
The number 1 becomes the next digit in our result. 
Result so far: 121782.70606531
Subtracting 643 from 1210 leaves us with 567.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5670, and continue the process.

In conclusion, the division gives 121782.70606531 with a balance of 5.67e-07.