629992 ÷ 31 
The aim is to understand the frequency of 31 in 629992.

Step 1:
If we divide 6 by 31, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 31

Let's proceed to step 2:
When dividing 62 by 31, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 62 from 62, we get 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 31

On to step 3:
9 divided by 31 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 20.0
The remainder is 9 after subtracting 0 from 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 31

Advancing to step 4:
99 divided by 31 is 3 with a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 203.0
Subtract 93 from 99 to get 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 31

Going ahead to step 5:
69 divided by 31 is 2 with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2032.0
Deduct 62 from 69 and we're left with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 31

Moving on to step 6:
The number 31 fits into 72 2 times, leaving a remainder of 10.
The next digit of our result is 2. 
Result so far: 20322.0
If we subtract 62 from 72, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
31 goes into 100 3 times with a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 20322.3
Deduct 93 from 100 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 8:
When dividing 70 by 31, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 20322.32
If we take 62 away from 70, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
80 divided by 31 is 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 20322.322
Subtracting 62 from 80 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The quotient of the division is 20322.322, and the remainder is 0.0018.