We're dividing 78937470 by 990 
We want to figure out the number of times 78937470 can be divided by 990.

Step 1:
When dividing 7 by 990, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 990

Step 2:
78 divided by 990 is 0 with a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Take the next digit (9) from the dividend and append it to 78, then repeat: 789 / 990

Going ahead to step 3:
The number 990 fits into 789 0 times, leaving a remainder of 789.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 789, we end up with 789.
Take the next digit (3) from the dividend and append it to 789, then repeat: 7893 / 990

Step 4:
If we divide 7893 by 990, we get 7 and a remainder of 963.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 6930 from 7893 to get 963.
Take the next digit (7) from the dividend and append it to 963, then repeat: 9637 / 990

Going ahead to step 5:
The number 990 fits into 9637 9 times, leaving a remainder of 727.
The next digit of our result is 9. 
Result so far: 79.0
If we subtract 8910 from 9637, we get 727.
Bring next digit (4) of the dividend behind the 727 and repeat the process: 7274 / 990

On to step 6:
When dividing 7274 by 990, we get 7 with a remainder of 344.
Write down 7 as next digit of the result. 
Result so far: 797.0
Subtract 6930 from 7274 to get 344.
Include the next digit (7) from the dividend after 344, then repeat: 3447 / 990

Advancing to step 7:
990 goes into 3447 3 times with a remainder of 477.
Write down 3 as next digit of the result. 
Result so far: 7973.0
Subtracting 2970 from 3447 leaves us with 477.
Take the next digit (0) from the dividend and append it to 477, then repeat: 4770 / 990

Moving on to step 8:
If we divide 4770 by 990, we get 4 and a remainder of 810.
Write down 4 as next digit of the result. 
Result so far: 79734.0
If we subtract 3960 from 4770, we get 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Moving on to step 9:
990 can be fit into 8100 8 times, resulting in a remainder of 180.
Record the quotient 8 as the next digit in the result. 
Result so far: 79734.8
Subtract 7920 from 8100 to get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Advancing to step 10:
990 can be fit into 1800 1 times, resulting in a remainder of 810.
Put 1 as the next digit of the answer. 
Result so far: 79734.81
Deduct 990 from 1800 and we're left with 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Going ahead to step 11:
990 can be fit into 8100 8 times, resulting in a remainder of 180.
Put 8 as the next digit of the answer. 
Result so far: 79734.818
Deduct 7920 from 8100 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

On to step 12:
990 can be fit into 1800 1 times, resulting in a remainder of 810.
The next digit of our result is 1. 
Result so far: 79734.8181
Deduct 990 from 1800 and we're left with 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Moving on to step 13:
8100 divided by 990 is 8 with a remainder of 180.
The next digit of our result is 8. 
Result so far: 79734.81818
Subtract 7920 from 8100 to get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Step 14:
When dividing 1800 by 990, we get 1 with a remainder of 810.
Record the quotient 1 as the next digit in the result. 
Result so far: 79734.818181
Subtracting 990 from 1800 leaves us with 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Moving on to step 15:
The number 990 fits into 8100 8 times, leaving a remainder of 180.
The next digit of our result is 8. 
Result so far: 79734.8181818
Deduct 7920 from 8100 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Let's proceed to step 16:
990 can be fit into 1800 1 times, resulting in a remainder of 810.
The number 1 becomes the next digit in our result. 
Result so far: 79734.81818181
Subtracting 990 from 1800 leaves us with 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

The final outcome is 79734.81818181, with a leftover of 8.1e-07.