12399310 divided by 584 
The aim is to understand the frequency of 584 in 12399310.

On to step 1:
When dividing 1 by 584, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 584

Moving on to step 2:
584 can be fit into 12 0 times, resulting in a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 584

Step 3:
When dividing 123 by 584, we get 0 with a remainder of 123.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 123, we end up with 123.
Take the next digit (9) from the dividend and append it to 123, then repeat: 1239 / 584

Going ahead to step 4:
584 goes into 1239 2 times with a remainder of 71.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 71 after subtracting 1168 from 1239.
Include the next digit (9) from the dividend after 71, then repeat: 719 / 584

Advancing to step 5:
719 divided by 584 is 1 with a remainder of 135.
The next digit of our result is 1. 
Result so far: 21.0
Subtracting 584 from 719 leaves us with 135.
Fetch the next digit (3) from the dividend, attach it to 135 and continue: 1353 / 584

On to step 6:
1353 divided by 584 is 2 with a remainder of 185.
Use 2 as the next digit of our solution. 
Result so far: 212.0
If we subtract 1168 from 1353, we get 185.
Fetch the next digit (1) from the dividend, attach it to 185 and continue: 1851 / 584

Moving on to step 7:
The number 584 fits into 1851 3 times, leaving a remainder of 99.
Use 3 as the next digit of our solution. 
Result so far: 2123.0
Subtracting 1752 from 1851 leaves us with 99.
Append the next digit (0) from the dividend to 99 and continue with: 990 / 584

Step 8:
When dividing 990 by 584, we get 1 with a remainder of 406.
The number 1 becomes the next digit in our result. 
Result so far: 21231.0
If we subtract 584 from 990, we get 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Let's proceed to step 9:
When dividing 4060 by 584, we get 6 with a remainder of 556.
The number 6 becomes the next digit in our result. 
Result so far: 21231.6
The remainder is 556 after subtracting 3504 from 4060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5560, and continue the process.

Going ahead to step 10:
5560 divided by 584 is 9 with a remainder of 304.
Record the quotient 9 as the next digit in the result. 
Result so far: 21231.69
The remainder is 304 after subtracting 5256 from 5560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Moving on to step 11:
584 goes into 3040 5 times with a remainder of 120.
Use 5 as the next digit of our solution. 
Result so far: 21231.695
If we subtract 2920 from 3040, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 12:
The number 584 fits into 1200 2 times, leaving a remainder of 32.
Record the quotient 2 as the next digit in the result. 
Result so far: 21231.6952
If we take 1168 away from 1200, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 13:
584 can be fit into 320 0 times, resulting in a remainder of 320.
Record the quotient 0 as the next digit in the result. 
Result so far: 21231.6952
Deduct 0 from 320 and we're left 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.

Advancing to step 14:
3200 divided by 584 is 5 with a remainder of 280.
The next digit of our result is 5. 
Result so far: 21231.695205
Subtract 2920 from 3200 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 15:
2800 divided by 584 is 4 with a remainder of 464.
Use 4 as the next digit of our solution. 
Result so far: 21231.6952054
The remainder is 464 after subtracting 2336 from 2800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

Going ahead to step 16:
4640 divided by 584 is 7 with a remainder of 552.
Write down 7 as next digit of the result. 
Result so far: 21231.69520547
The remainder is 552 after subtracting 4088 from 4640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

The final result is 21231.69520547 with a remainder of 5.52e-07.