Let's divide 10402857 by 990
The aim is to understand the frequency of 990 in 10402857.

Going ahead to step 1:
990 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 990

Advancing to step 2:
The number 990 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 10 after subtracting 0 from 10.
Fetch the next digit (4) from the dividend, attach it to 10 and continue: 104 / 990

Moving on to step 3:
990 goes into 104 0 times with a remainder of 104.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 104 leaves us with 104.
Include the next digit (0) from the dividend after 104, then repeat: 1040 / 990

Going ahead to step 4:
If we divide 1040 by 990, we get 1 and a remainder of 50.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 990 from 1040 to get 50.
Include the next digit (2) from the dividend after 50, then repeat: 502 / 990

Step 5:
The number 990 fits into 502 0 times, leaving a remainder of 502.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Deduct 0 from 502 and we're left with 502.
Bring next digit (8) of the dividend behind the 502 and repeat the process: 5028 / 990

On to step 6:
When dividing 5028 by 990, we get 5 with a remainder of 78.
Use 5 as the next digit of our solution. 
Result so far: 105.0
Subtract 4950 from 5028 to get 78.
Bring next digit (5) of the dividend behind the 78 and repeat the process: 785 / 990

On to step 7:
990 goes into 785 0 times with a remainder of 785.
Write down 0 as next digit of the result. 
Result so far: 1050.0
If we subtract 0 from 785, we get 785.
Fetch the next digit (7) from the dividend, attach it to 785 and continue: 7857 / 990

Going ahead to step 8:
When dividing 7857 by 990, we get 7 with a remainder of 927.
Put 7 as the next digit of the answer. 
Result so far: 10507.0
Deduct 6930 from 7857 and we're left with 927.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9270, and continue the process.

On to step 9:
If we divide 9270 by 990, we get 9 and a remainder of 360.
Record the quotient 9 as the next digit in the result. 
Result so far: 10507.9
The remainder is 360 after subtracting 8910 from 9270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Let's proceed to step 10:
If we divide 3600 by 990, we get 3 and a remainder of 630.
The next digit of our result is 3. 
Result so far: 10507.93
If we subtract 2970 from 3600, we get 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Going ahead to step 11:
If we divide 6300 by 990, we get 6 and a remainder of 360.
The number 6 becomes the next digit in our result. 
Result so far: 10507.936
Subtract 5940 from 6300 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Moving on to step 12:
The number 990 fits into 3600 3 times, leaving a remainder of 630.
Record the quotient 3 as the next digit in the result. 
Result so far: 10507.9363
If we take 2970 away from 3600, we end up with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Step 13:
6300 divided by 990 is 6 with a remainder of 360.
Record the quotient 6 as the next digit in the result. 
Result so far: 10507.93636
Subtracting 5940 from 6300 leaves us with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Let's proceed to step 14:
990 can be fit into 3600 3 times, resulting in a remainder of 630.
Record the quotient 3 as the next digit in the result. 
Result so far: 10507.936363
Subtracting 2970 from 3600 leaves us with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Advancing to step 15:
If we divide 6300 by 990, we get 6 and a remainder of 360.
Record the quotient 6 as the next digit in the result. 
Result so far: 10507.9363636
The remainder is 360 after subtracting 5940 from 6300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 16:
The number 990 fits into 3600 3 times, leaving a remainder of 630.
Record the quotient 3 as the next digit in the result. 
Result so far: 10507.93636363
If we take 2970 away from 3600, we end up with 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

The final outcome is 10507.93636363, with a leftover of 6.3e-07.