78504845 ÷ 648 
Our goal is to divide 78504845 by 648.

Going ahead to step 1:
7 divided by 648 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 648

Going ahead to step 2:
When dividing 78 by 648, we get 0 with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Append the next digit (5) from the dividend to 78 and continue with: 785 / 648

Advancing to step 3:
648 can be fit into 785 1 times, resulting in a remainder of 137.
The next digit of our result is 1. 
Result so far: 1.0
If we take 648 away from 785, we end up with 137.
Take the next digit (0) from the dividend and append it to 137, then repeat: 1370 / 648

Advancing to step 4:
648 goes into 1370 2 times with a remainder of 74.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtract 1296 from 1370 to get 74.
Fetch the next digit (4) from the dividend, attach it to 74 and continue: 744 / 648

Step 5:
744 divided by 648 is 1 with a remainder of 96.
The next digit of our result is 1. 
Result so far: 121.0
Subtract 648 from 744 to get 96.
Include the next digit (8) from the dividend after 96, then repeat: 968 / 648

Going ahead to step 6:
If we divide 968 by 648, we get 1 and a remainder of 320.
Use 1 as the next digit of our solution. 
Result so far: 1211.0
If we subtract 648 from 968, we get 320.
Append the next digit (4) from the dividend to 320 and continue with: 3204 / 648

Moving on to step 7:
If we divide 3204 by 648, we get 4 and a remainder of 612.
Put 4 as the next digit of the answer. 
Result so far: 12114.0
If we take 2592 away from 3204, we end up with 612.
Fetch the next digit (5) from the dividend, attach it to 612 and continue: 6125 / 648

Advancing to step 8:
6125 divided by 648 is 9 with a remainder of 293.
Record the quotient 9 as the next digit in the result. 
Result so far: 121149.0
Subtract 5832 from 6125 to get 293.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

Moving on to step 9:
The number 648 fits into 2930 4 times, leaving a remainder of 338.
Put 4 as the next digit of the answer. 
Result so far: 121149.4
The remainder is 338 after subtracting 2592 from 2930.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Going ahead to step 10:
648 goes into 3380 5 times with a remainder of 140.
Use 5 as the next digit of our solution. 
Result so far: 121149.45
The remainder is 140 after subtracting 3240 from 3380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 11:
648 can be fit into 1400 2 times, resulting in a remainder of 104.
Put 2 as the next digit of the answer. 
Result so far: 121149.452
If we take 1296 away from 1400, we end up with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

On to step 12:
When dividing 1040 by 648, we get 1 with a remainder of 392.
The next digit of our result is 1. 
Result so far: 121149.4521
Subtract 648 from 1040 to get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Moving on to step 13:
3920 divided by 648 is 6 with a remainder of 32.
Use 6 as the next digit of our solution. 
Result so far: 121149.45216
Subtract 3888 from 3920 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 14:
320 divided by 648 is 0 with a remainder of 320.
Use 0 as the next digit of our solution. 
Result so far: 121149.45216
Subtracting 0 from 320 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Going ahead to step 15:
If we divide 3200 by 648, we get 4 and a remainder of 608.
The number 4 becomes the next digit in our result. 
Result so far: 121149.4521604
Subtract 2592 from 3200 to get 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Step 16:
The number 648 fits into 6080 9 times, leaving a remainder of 248.
Put 9 as the next digit of the answer. 
Result so far: 121149.45216049
If we subtract 5832 from 6080, we get 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

In conclusion, the division gives 121149.45216049 with a balance of 2.48e-07.