78453089 divided by 991 
We want to figure out the number of times 78453089 can be divided by 991.

Advancing to step 1:
991 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 991

Let's proceed to step 2:
78 divided by 991 is 0 with a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Append the next digit (4) from the dividend to 78 and continue with: 784 / 991

Advancing to step 3:
991 can be fit into 784 0 times, resulting in a remainder of 784.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 784 leaves us with 784.
Take the next digit (5) from the dividend and append it to 784, then repeat: 7845 / 991

Advancing to step 4:
If we divide 7845 by 991, we get 7 and a remainder of 908.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Deduct 6937 from 7845 and we're left with 908.
Append the next digit (3) from the dividend to 908 and continue with: 9083 / 991

Moving on to step 5:
If we divide 9083 by 991, we get 9 and a remainder of 164.
Put 9 as the next digit of the answer. 
Result so far: 79.0
Subtracting 8919 from 9083 leaves us with 164.
Append the next digit (0) from the dividend to 164 and continue with: 1640 / 991

Let's proceed to step 6:
When dividing 1640 by 991, we get 1 with a remainder of 649.
Record the quotient 1 as the next digit in the result. 
Result so far: 791.0
The remainder is 649 after subtracting 991 from 1640.
Bring next digit (8) of the dividend behind the 649 and repeat the process: 6498 / 991

Step 7:
6498 divided by 991 is 6 with a remainder of 552.
The next digit of our result is 6. 
Result so far: 7916.0
If we take 5946 away from 6498, we end up with 552.
Append the next digit (9) from the dividend to 552 and continue with: 5529 / 991

On to step 8:
991 goes into 5529 5 times with a remainder of 574.
The next digit of our result is 5. 
Result so far: 79165.0
If we subtract 4955 from 5529, we get 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

Let's proceed to step 9:
5740 divided by 991 is 5 with a remainder of 785.
The number 5 becomes the next digit in our result. 
Result so far: 79165.5
The remainder is 785 after subtracting 4955 from 5740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7850, and continue the process.

Advancing to step 10:
991 goes into 7850 7 times with a remainder of 913.
The next digit of our result is 7. 
Result so far: 79165.57
If we subtract 6937 from 7850, we get 913.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9130, and continue the process.

Moving on to step 11:
991 can be fit into 9130 9 times, resulting in a remainder of 211.
Write down 9 as next digit of the result. 
Result so far: 79165.579
Subtracting 8919 from 9130 leaves us with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Let's proceed to step 12:
If we divide 2110 by 991, we get 2 and a remainder of 128.
Record the quotient 2 as the next digit in the result. 
Result so far: 79165.5792
The remainder is 128 after subtracting 1982 from 2110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 13:
The number 991 fits into 1280 1 times, leaving a remainder of 289.
Write down 1 as next digit of the result. 
Result so far: 79165.57921
Subtracting 991 from 1280 leaves us with 289.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2890, and continue the process.

On to step 14:
991 goes into 2890 2 times with a remainder of 908.
Put 2 as the next digit of the answer. 
Result so far: 79165.579212
Subtract 1982 from 2890 to get 908.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9080, and continue the process.

On to step 15:
The number 991 fits into 9080 9 times, leaving a remainder of 161.
Put 9 as the next digit of the answer. 
Result so far: 79165.5792129
Subtracting 8919 from 9080 leaves us with 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Moving on to step 16:
991 goes into 1610 1 times with a remainder of 619.
Use 1 as the next digit of our solution. 
Result so far: 79165.57921291
Subtracting 991 from 1610 leaves us with 619.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6190, and continue the process.

In conclusion, the division gives 79165.57921291 with a balance of 6.19e-07.