We look at the division of 78671609 by 990 
Let's see how many times 990 fits into 78671609.

On to step 1:
The number 990 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.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 990

Let's proceed to step 2:
If we divide 78 by 990, we get 0 and a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Append the next digit (6) from the dividend to 78 and continue with: 786 / 990

On to step 3:
786 divided by 990 is 0 with a remainder of 786.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 786, we end up with 786.
Append the next digit (7) from the dividend to 786 and continue with: 7867 / 990

Moving on to step 4:
If we divide 7867 by 990, we get 7 and a remainder of 937.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 6930 from 7867, we get 937.
Take the next digit (1) from the dividend and append it to 937, then repeat: 9371 / 990

Step 5:
The number 990 fits into 9371 9 times, leaving a remainder of 461.
The next digit of our result is 9. 
Result so far: 79.0
If we subtract 8910 from 9371, we get 461.
Fetch the next digit (6) from the dividend, attach it to 461 and continue: 4616 / 990

Going ahead to step 6:
When dividing 4616 by 990, we get 4 with a remainder of 656.
Record the quotient 4 as the next digit in the result. 
Result so far: 794.0
If we take 3960 away from 4616, we end up with 656.
Bring next digit (0) of the dividend behind the 656 and repeat the process: 6560 / 990

Step 7:
990 can be fit into 6560 6 times, resulting in a remainder of 620.
The next digit of our result is 6. 
Result so far: 7946.0
If we subtract 5940 from 6560, we get 620.
Fetch the next digit (9) from the dividend, attach it to 620 and continue: 6209 / 990

Moving on to step 8:
If we divide 6209 by 990, we get 6 and a remainder of 269.
Record the quotient 6 as the next digit in the result. 
Result so far: 79466.0
Subtracting 5940 from 6209 leaves us with 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

Let's proceed to step 9:
If we divide 2690 by 990, we get 2 and a remainder of 710.
Record the quotient 2 as the next digit in the result. 
Result so far: 79466.2
If we subtract 1980 from 2690, we get 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

Advancing to step 10:
If we divide 7100 by 990, we get 7 and a remainder of 170.
Put 7 as the next digit of the answer. 
Result so far: 79466.27
If we subtract 6930 from 7100, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 11:
The number 990 fits into 1700 1 times, leaving a remainder of 710.
The number 1 becomes the next digit in our result. 
Result so far: 79466.271
The remainder is 710 after subtracting 990 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

On to step 12:
990 goes into 7100 7 times with a remainder of 170.
The number 7 becomes the next digit in our result. 
Result so far: 79466.2717
Deduct 6930 from 7100 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Advancing to step 13:
If we divide 1700 by 990, we get 1 and a remainder of 710.
Record the quotient 1 as the next digit in the result. 
Result so far: 79466.27171
Deduct 990 from 1700 and we're left with 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

Going ahead to step 14:
7100 divided by 990 is 7 with a remainder of 170.
Put 7 as the next digit of the answer. 
Result so far: 79466.271717
Deduct 6930 from 7100 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 15:
990 can be fit into 1700 1 times, resulting in a remainder of 710.
Record the quotient 1 as the next digit in the result. 
Result so far: 79466.2717171
The remainder is 710 after subtracting 990 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

Step 16:
When dividing 7100 by 990, we get 7 with a remainder of 170.
The next digit of our result is 7. 
Result so far: 79466.27171717
Deduct 6930 from 7100 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Our division results in 79466.27171717 with a remaining 1.7e-07.