65490121 ÷ 830 
The aim is to understand the frequency of 830 in 65490121.

Step 1:
830 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 830

Going ahead to step 2:
The number 830 fits into 65 0 times, leaving a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 65 after subtracting 0 from 65.
Bring next digit (4) of the dividend behind the 65 and repeat the process: 654 / 830

On to step 3:
830 can be fit into 654 0 times, resulting in a remainder of 654.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 654, we get 654.
Take the next digit (9) from the dividend and append it to 654, then repeat: 6549 / 830

Moving on to step 4:
830 goes into 6549 7 times with a remainder of 739.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 739 after subtracting 5810 from 6549.
Bring next digit (0) of the dividend behind the 739 and repeat the process: 7390 / 830

On to step 5:
When dividing 7390 by 830, we get 8 with a remainder of 750.
Write down 8 as next digit of the result. 
Result so far: 78.0
If we take 6640 away from 7390, we end up with 750.
Bring next digit (1) of the dividend behind the 750 and repeat the process: 7501 / 830

Going ahead to step 6:
When dividing 7501 by 830, we get 9 with a remainder of 31.
Write down 9 as next digit of the result. 
Result so far: 789.0
If we subtract 7470 from 7501, we get 31.
Bring next digit (2) of the dividend behind the 31 and repeat the process: 312 / 830

Let's proceed to step 7:
When dividing 312 by 830, we get 0 with a remainder of 312.
Record the quotient 0 as the next digit in the result. 
Result so far: 7890.0
Deduct 0 from 312 and we're left with 312.
Append the next digit (1) from the dividend to 312 and continue with: 3121 / 830

On to step 8:
When dividing 3121 by 830, we get 3 with a remainder of 631.
Use 3 as the next digit of our solution. 
Result so far: 78903.0
Deduct 2490 from 3121 and we're left with 631.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6310, and continue the process.

Advancing to step 9:
830 can be fit into 6310 7 times, resulting in a remainder of 500.
Record the quotient 7 as the next digit in the result. 
Result so far: 78903.7
If we take 5810 away from 6310, we end up with 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Let's proceed to step 10:
If we divide 5000 by 830, we get 6 and a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 78903.76
Subtracting 4980 from 5000 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 11:
The number 830 fits into 200 0 times, leaving a remainder of 200.
Write down 0 as next digit of the result. 
Result so far: 78903.76
Deduct 0 from 200 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 12:
830 can be fit into 2000 2 times, resulting in a remainder of 340.
The number 2 becomes the next digit in our result. 
Result so far: 78903.7602
Deduct 1660 from 2000 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 13:
3400 divided by 830 is 4 with a remainder of 80.
Use 4 as the next digit of our solution. 
Result so far: 78903.76024
If we take 3320 away from 3400, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 14:
When dividing 800 by 830, we get 0 with a remainder of 800.
Put 0 as the next digit of the answer. 
Result so far: 78903.76024
If we take 0 away from 800, we end up with 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Let's proceed to step 15:
830 can be fit into 8000 9 times, resulting in a remainder of 530.
Write down 9 as next digit of the result. 
Result so far: 78903.7602409
Subtract 7470 from 8000 to get 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

On to step 16:
If we divide 5300 by 830, we get 6 and a remainder of 320.
Write down 6 as next digit of the result. 
Result so far: 78903.76024096
Subtracting 4980 from 5300 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

The final outcome is 78903.76024096, with a leftover of 3.2e-07.