Let's divide 78108138 by 771
We're looking to find how many times 771 goes into 78108138.

Advancing to step 1:
771 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 771

Going ahead to step 2:
If we divide 78 by 771, we get 0 and a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Grab the next digit (1) from the dividend, add it to 78, then carry on: 781 / 771

On to step 3:
771 goes into 781 1 times with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 10 after subtracting 771 from 781.
Grab the next digit (0) from the dividend, add it to 10, then carry on: 100 / 771

Going ahead to step 4:
771 can be fit into 100 0 times, resulting in a remainder of 100.
The next digit of our result is 0. 
Result so far: 10.0
If we take 0 away from 100, we end up with 100.
Grab the next digit (8) from the dividend, add it to 100, then carry on: 1008 / 771

On to step 5:
When dividing 1008 by 771, we get 1 with a remainder of 237.
Use 1 as the next digit of our solution. 
Result so far: 101.0
If we take 771 away from 1008, we end up with 237.
Append the next digit (1) from the dividend to 237 and continue with: 2371 / 771

Moving on to step 6:
771 can be fit into 2371 3 times, resulting in a remainder of 58.
Use 3 as the next digit of our solution. 
Result so far: 1013.0
Subtracting 2313 from 2371 leaves us with 58.
Bring next digit (3) of the dividend behind the 58 and repeat the process: 583 / 771

Step 7:
583 divided by 771 is 0 with a remainder of 583.
The number 0 becomes the next digit in our result. 
Result so far: 10130.0
Subtract 0 from 583 to get 583.
Include the next digit (8) from the dividend after 583, then repeat: 5838 / 771

Moving on to step 8:
The number 771 fits into 5838 7 times, leaving a remainder of 441.
Record the quotient 7 as the next digit in the result. 
Result so far: 101307.0
Deduct 5397 from 5838 and we're left with 441.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4410, and continue the process.

Going ahead to step 9:
When dividing 4410 by 771, we get 5 with a remainder of 555.
The number 5 becomes the next digit in our result. 
Result so far: 101307.5
Subtracting 3855 from 4410 leaves us with 555.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5550, and continue the process.

Advancing to step 10:
If we divide 5550 by 771, we get 7 and a remainder of 153.
Write down 7 as next digit of the result. 
Result so far: 101307.57
Deduct 5397 from 5550 and we're left with 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

Going ahead to step 11:
When dividing 1530 by 771, we get 1 with a remainder of 759.
The number 1 becomes the next digit in our result. 
Result so far: 101307.571
Deduct 771 from 1530 and we're left with 759.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7590, and continue the process.

Going ahead to step 12:
When dividing 7590 by 771, we get 9 with a remainder of 651.
Put 9 as the next digit of the answer. 
Result so far: 101307.5719
Subtracting 6939 from 7590 leaves us with 651.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6510, and continue the process.

Going ahead to step 13:
771 can be fit into 6510 8 times, resulting in a remainder of 342.
The next digit of our result is 8. 
Result so far: 101307.57198
If we take 6168 away from 6510, we end up 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.

Going ahead to step 14:
If we divide 3420 by 771, we get 4 and a remainder of 336.
Record the quotient 4 as the next digit in the result. 
Result so far: 101307.571984
Subtracting 3084 from 3420 leaves us with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Moving on to step 15:
3360 divided by 771 is 4 with a remainder of 276.
Put 4 as the next digit of the answer. 
Result so far: 101307.5719844
If we subtract 3084 from 3360, we get 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

After the division, we end up with 101307.5719844 and a remainder of 2.76e-06.