78157650 ÷ 661 
We want to figure out the number of times 78157650 can be divided by 661.

Let's proceed to step 1:
The number 661 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 661

Let's proceed to step 2:
661 can be fit into 78 0 times, resulting in a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Grab the next digit (1) from the dividend, add it to 78, then carry on: 781 / 661

On to step 3:
The number 661 fits into 781 1 times, leaving a remainder of 120.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 120 after subtracting 661 from 781.
Grab the next digit (5) from the dividend, add it to 120, then carry on: 1205 / 661

Step 4:
661 goes into 1205 1 times with a remainder of 544.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 661 from 1205, we get 544.
Fetch the next digit (7) from the dividend, attach it to 544 and continue: 5447 / 661

Step 5:
661 can be fit into 5447 8 times, resulting in a remainder of 159.
Put 8 as the next digit of the answer. 
Result so far: 118.0
Deduct 5288 from 5447 and we're left with 159.
Include the next digit (6) from the dividend after 159, then repeat: 1596 / 661

Advancing to step 6:
If we divide 1596 by 661, we get 2 and a remainder of 274.
Put 2 as the next digit of the answer. 
Result so far: 1182.0
If we subtract 1322 from 1596, we get 274.
Append the next digit (5) from the dividend to 274 and continue with: 2745 / 661

Moving on to step 7:
The number 661 fits into 2745 4 times, leaving a remainder of 101.
The number 4 becomes the next digit in our result. 
Result so far: 11824.0
The remainder is 101 after subtracting 2644 from 2745.
Fetch the next digit (0) from the dividend, attach it to 101 and continue: 1010 / 661

On to step 8:
661 goes into 1010 1 times with a remainder of 349.
Use 1 as the next digit of our solution. 
Result so far: 118241.0
If we subtract 661 from 1010, we get 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Going ahead to step 9:
661 goes into 3490 5 times with a remainder of 185.
Record the quotient 5 as the next digit in the result. 
Result so far: 118241.5
If we take 3305 away from 3490, we end up with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Advancing to step 10:
661 can be fit into 1850 2 times, resulting in a remainder of 528.
The number 2 becomes the next digit in our result. 
Result so far: 118241.52
If we subtract 1322 from 1850, we get 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Going ahead to step 11:
661 can be fit into 5280 7 times, resulting in a remainder of 653.
The next digit of our result is 7. 
Result so far: 118241.527
The remainder is 653 after subtracting 4627 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6530, and continue the process.

On to step 12:
661 goes into 6530 9 times with a remainder of 581.
Write down 9 as next digit of the result. 
Result so far: 118241.5279
Subtracting 5949 from 6530 leaves us with 581.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5810, and continue the process.

Going ahead to step 13:
5810 divided by 661 is 8 with a remainder of 522.
Use 8 as the next digit of our solution. 
Result so far: 118241.52798
If we take 5288 away from 5810, we end up with 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Advancing to step 14:
If we divide 5220 by 661, we get 7 and a remainder of 593.
The number 7 becomes the next digit in our result. 
Result so far: 118241.527987
Deduct 4627 from 5220 and we're left with 593.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5930, and continue the process.

Advancing to step 15:
The number 661 fits into 5930 8 times, leaving a remainder of 642.
Use 8 as the next digit of our solution. 
Result so far: 118241.5279878
Subtracting 5288 from 5930 leaves us with 642.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6420, and continue the process.

On to step 16:
The number 661 fits into 6420 9 times, leaving a remainder of 471.
Write down 9 as next digit of the result. 
Result so far: 118241.52798789
If we subtract 5949 from 6420, we get 471.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4710, and continue the process.

Our division results in 118241.52798789 with a remaining 4.71e-07.