Let's divide 76973899 by 990
The aim is to understand the frequency of 990 in 76973899.

On to step 1:
990 can be fit into 7 0 times, resulting in 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.
Include the next digit (6) from the dividend after 7, then repeat: 76 / 990

Going ahead to step 2:
If we divide 76 by 990, we get 0 and a remainder of 76.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 76 after subtracting 0 from 76.
Fetch the next digit (9) from the dividend, attach it to 76 and continue: 769 / 990

Moving on to step 3:
The number 990 fits into 769 0 times, leaving a remainder of 769.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 769 after subtracting 0 from 769.
Take the next digit (7) from the dividend and append it to 769, then repeat: 7697 / 990

Let's proceed to step 4:
If we divide 7697 by 990, we get 7 and a remainder of 767.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtract 6930 from 7697 to get 767.
Append the next digit (3) from the dividend to 767 and continue with: 7673 / 990

Step 5:
7673 divided by 990 is 7 with a remainder of 743.
Put 7 as the next digit of the answer. 
Result so far: 77.0
If we take 6930 away from 7673, we end up with 743.
Append the next digit (8) from the dividend to 743 and continue with: 7438 / 990

Moving on to step 6:
When dividing 7438 by 990, we get 7 with a remainder of 508.
Write down 7 as next digit of the result. 
Result so far: 777.0
The remainder is 508 after subtracting 6930 from 7438.
Include the next digit (9) from the dividend after 508, then repeat: 5089 / 990

Advancing to step 7:
990 can be fit into 5089 5 times, resulting in a remainder of 139.
Put 5 as the next digit of the answer. 
Result so far: 7775.0
Subtracting 4950 from 5089 leaves us with 139.
Take the next digit (9) from the dividend and append it to 139, then repeat: 1399 / 990

Advancing to step 8:
When dividing 1399 by 990, we get 1 with a remainder of 409.
Write down 1 as next digit of the result. 
Result so far: 77751.0
The remainder is 409 after subtracting 990 from 1399.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4090, and continue the process.

Step 9:
4090 divided by 990 is 4 with a remainder of 130.
The number 4 becomes the next digit in our result. 
Result so far: 77751.4
Subtracting 3960 from 4090 leaves us with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

On to step 10:
The number 990 fits into 1300 1 times, leaving a remainder of 310.
The next digit of our result is 1. 
Result so far: 77751.41
Subtract 990 from 1300 to get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Going ahead to step 11:
990 can be fit into 3100 3 times, resulting in a remainder of 130.
Put 3 as the next digit of the answer. 
Result so far: 77751.413
Deduct 2970 from 3100 and we're left with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

On to step 12:
The number 990 fits into 1300 1 times, leaving a remainder of 310.
The next digit of our result is 1. 
Result so far: 77751.4131
If we take 990 away from 1300, we end up with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

On to step 13:
When dividing 3100 by 990, we get 3 with a remainder of 130.
Write down 3 as next digit of the result. 
Result so far: 77751.41313
If we take 2970 away from 3100, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 14:
The number 990 fits into 1300 1 times, leaving a remainder of 310.
Record the quotient 1 as the next digit in the result. 
Result so far: 77751.413131
Deduct 990 from 1300 and we're left with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Going ahead to step 15:
When dividing 3100 by 990, we get 3 with a remainder of 130.
Write down 3 as next digit of the result. 
Result so far: 77751.4131313
Subtract 2970 from 3100 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 16:
When dividing 1300 by 990, we get 1 with a remainder of 310.
The next digit of our result is 1. 
Result so far: 77751.41313131
If we take 990 away from 1300, we end up with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

The final outcome is 77751.41313131, with a leftover of 3.1e-07.