2580030 ÷ 31 
The aim is to understand the frequency of 31 in 2580030.

Step 1:
2 divided by 31 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 31

On to step 2:
The number 31 fits into 25 0 times, leaving a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 31

Going ahead to step 3:
When dividing 258 by 31, we get 8 with a remainder of 10.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 10 after subtracting 248 from 258.
Fetch the next digit (0) from the dividend, attach it to 10 and continue: 100 / 31

On to step 4:
If we divide 100 by 31, we get 3 and a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 83.0
If we subtract 93 from 100, we get 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 31

Moving on to step 5:
70 divided by 31 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 832.0
If we subtract 62 from 70, we get 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 31

Moving on to step 6:
83 divided by 31 is 2 with a remainder of 21.
Write down 2 as next digit of the result. 
Result so far: 8322.0
Subtract 62 from 83 to get 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 31

Going ahead to step 7:
The number 31 fits into 210 6 times, leaving a remainder of 24.
Write down 6 as next digit of the result. 
Result so far: 83226.0
If we take 186 away from 210, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 8:
31 goes into 240 7 times with a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 83226.7
Deduct 217 from 240 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 9:
230 divided by 31 is 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 83226.77
The remainder is 13 after subtracting 217 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

After the division, we end up with 83226.77 and a remainder of 0.013.