39998959 divided by 580 
The aim is to understand the frequency of 580 in 39998959.

Step 1:
580 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 580

On to step 2:
580 can be fit into 39 0 times, resulting in a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Bring next digit (9) of the dividend behind the 39 and repeat the process: 399 / 580

Going ahead to step 3:
The number 580 fits into 399 0 times, leaving a remainder of 399.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 399 leaves us with 399.
Grab the next digit (9) from the dividend, add it to 399, then carry on: 3999 / 580

Let's proceed to step 4:
580 goes into 3999 6 times with a remainder of 519.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 3480 from 3999, we get 519.
Grab the next digit (8) from the dividend, add it to 519, then carry on: 5198 / 580

Advancing to step 5:
580 can be fit into 5198 8 times, resulting in a remainder of 558.
Write down 8 as next digit of the result. 
Result so far: 68.0
The remainder is 558 after subtracting 4640 from 5198.
Include the next digit (9) from the dividend after 558, then repeat: 5589 / 580

On to step 6:
If we divide 5589 by 580, we get 9 and a remainder of 369.
The number 9 becomes the next digit in our result. 
Result so far: 689.0
Subtracting 5220 from 5589 leaves us with 369.
Grab the next digit (5) from the dividend, add it to 369, then carry on: 3695 / 580

Moving on to step 7:
580 goes into 3695 6 times with a remainder of 215.
Write down 6 as next digit of the result. 
Result so far: 6896.0
Subtract 3480 from 3695 to get 215.
Include the next digit (9) from the dividend after 215, then repeat: 2159 / 580

Advancing to step 8:
2159 divided by 580 is 3 with a remainder of 419.
Use 3 as the next digit of our solution. 
Result so far: 68963.0
Subtracting 1740 from 2159 leaves us with 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4190, and continue the process.

Step 9:
The number 580 fits into 4190 7 times, leaving a remainder of 130.
Put 7 as the next digit of the answer. 
Result so far: 68963.7
If we subtract 4060 from 4190, we 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 10:
580 goes into 1300 2 times with a remainder of 140.
Use 2 as the next digit of our solution. 
Result so far: 68963.72
If we subtract 1160 from 1300, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 11:
When dividing 1400 by 580, we get 2 with a remainder of 240.
Use 2 as the next digit of our solution. 
Result so far: 68963.722
If we subtract 1160 from 1400, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The quotient of the division is 68963.722, and the remainder is 0.024.