We're dividing 12497877 by 990 
We want to figure out the number of times 12497877 can be divided by 990.

Step 1:
990 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 990

Going ahead to step 2:
If we divide 12 by 990, we get 0 and a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 990

Let's proceed to step 3:
If we divide 124 by 990, we get 0 and a remainder of 124.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 124 and we're left with 124.
Bring next digit (9) of the dividend behind the 124 and repeat the process: 1249 / 990

Going ahead to step 4:
If we divide 1249 by 990, we get 1 and a remainder of 259.
The next digit of our result is 1. 
Result so far: 1.0
If we take 990 away from 1249, we end up with 259.
Append the next digit (7) from the dividend to 259 and continue with: 2597 / 990

Going ahead to step 5:
990 can be fit into 2597 2 times, resulting in a remainder of 617.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
If we subtract 1980 from 2597, we get 617.
Fetch the next digit (8) from the dividend, attach it to 617 and continue: 6178 / 990

On to step 6:
When dividing 6178 by 990, we get 6 with a remainder of 238.
Record the quotient 6 as the next digit in the result. 
Result so far: 126.0
Subtract 5940 from 6178 to get 238.
Include the next digit (7) from the dividend after 238, then repeat: 2387 / 990

Step 7:
2387 divided by 990 is 2 with a remainder of 407.
The number 2 becomes the next digit in our result. 
Result so far: 1262.0
The remainder is 407 after subtracting 1980 from 2387.
Bring next digit (7) of the dividend behind the 407 and repeat the process: 4077 / 990

Step 8:
The number 990 fits into 4077 4 times, leaving a remainder of 117.
The number 4 becomes the next digit in our result. 
Result so far: 12624.0
If we take 3960 away from 4077, we end up with 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Going ahead to step 9:
1170 divided by 990 is 1 with a remainder of 180.
Record the quotient 1 as the next digit in the result. 
Result so far: 12624.1
Subtract 990 from 1170 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.

On to step 10:
1800 divided by 990 is 1 with a remainder of 810.
The next digit of our result is 1. 
Result so far: 12624.11
If we take 990 away from 1800, we end up 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 result is 12624.11 with a remainder of 0.81.