We divide 78910354 by 648
We want to divide 78910354 by 648.

Advancing to step 1:
When dividing 7 by 648, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 648

Going ahead to step 2:
648 can be fit into 78 0 times, resulting in a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Bring next digit (9) of the dividend behind the 78 and repeat the process: 789 / 648

Let's proceed to step 3:
648 goes into 789 1 times with a remainder of 141.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 141 after subtracting 648 from 789.
Take the next digit (1) from the dividend and append it to 141, then repeat: 1411 / 648

Advancing to step 4:
The number 648 fits into 1411 2 times, leaving a remainder of 115.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
The remainder is 115 after subtracting 1296 from 1411.
Bring next digit (0) of the dividend behind the 115 and repeat the process: 1150 / 648

Moving on to step 5:
If we divide 1150 by 648, we get 1 and a remainder of 502.
The number 1 becomes the next digit in our result. 
Result so far: 121.0
The remainder is 502 after subtracting 648 from 1150.
Append the next digit (3) from the dividend to 502 and continue with: 5023 / 648

On to step 6:
If we divide 5023 by 648, we get 7 and a remainder of 487.
Record the quotient 7 as the next digit in the result. 
Result so far: 1217.0
Subtract 4536 from 5023 to get 487.
Include the next digit (5) from the dividend after 487, then repeat: 4875 / 648

Step 7:
648 can be fit into 4875 7 times, resulting in a remainder of 339.
Record the quotient 7 as the next digit in the result. 
Result so far: 12177.0
Subtracting 4536 from 4875 leaves us with 339.
Bring next digit (4) of the dividend behind the 339 and repeat the process: 3394 / 648

Advancing to step 8:
The number 648 fits into 3394 5 times, leaving a remainder of 154.
Use 5 as the next digit of our solution. 
Result so far: 121775.0
Subtract 3240 from 3394 to get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Step 9:
When dividing 1540 by 648, we get 2 with a remainder of 244.
The number 2 becomes the next digit in our result. 
Result so far: 121775.2
If we subtract 1296 from 1540, we get 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Step 10:
2440 divided by 648 is 3 with a remainder of 496.
Use 3 as the next digit of our solution. 
Result so far: 121775.23
Deduct 1944 from 2440 and we're left with 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

On to step 11:
If we divide 4960 by 648, we get 7 and a remainder of 424.
The next digit of our result is 7. 
Result so far: 121775.237
Subtract 4536 from 4960 to get 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Advancing to step 12:
4240 divided by 648 is 6 with a remainder of 352.
Put 6 as the next digit of the answer. 
Result so far: 121775.2376
Deduct 3888 from 4240 and we're left with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Let's proceed to step 13:
When dividing 3520 by 648, we get 5 with a remainder of 280.
Use 5 as the next digit of our solution. 
Result so far: 121775.23765
If we subtract 3240 from 3520, we get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 14:
648 goes into 2800 4 times with a remainder of 208.
Put 4 as the next digit of the answer. 
Result so far: 121775.237654
Subtract 2592 from 2800 to get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Moving on to step 15:
If we divide 2080 by 648, we get 3 and a remainder of 136.
Put 3 as the next digit of the answer. 
Result so far: 121775.2376543
Subtracting 1944 from 2080 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Going ahead to step 16:
648 goes into 1360 2 times with a remainder of 64.
The number 2 becomes the next digit in our result. 
Result so far: 121775.23765432
If we subtract 1296 from 1360, we 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.

The quotient of the division is 121775.23765432, and the remainder is 6.4e-08.