720231 divided by 31 
The aim is to understand the frequency of 31 in 720231.

Step 1:
When dividing 7 by 31, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 31

Let's proceed to step 2:
72 divided by 31 is 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 62 from 72, we get 10.
Append the next digit (0) from the dividend to 10 and continue with: 100 / 31

Let's proceed to step 3:
If we divide 100 by 31, we get 3 and a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
Deduct 93 from 100 and we're left with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 31

Advancing to step 4:
31 goes into 72 2 times with a remainder of 10.
The next digit of our result is 2. 
Result so far: 232.0
Subtracting 62 from 72 leaves us with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 31

On to step 5:
The number 31 fits into 103 3 times, leaving a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 2323.0
Deduct 93 from 103 and we're left with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 31

Moving on to step 6:
101 divided by 31 is 3 with a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 23233.0
If we take 93 away from 101, 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.

Let's proceed to step 7:
The number 31 fits into 80 2 times, leaving a remainder of 18.
The next digit of our result is 2. 
Result so far: 23233.2
Deduct 62 from 80 and we're left 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.

Moving on to step 8:
The number 31 fits into 180 5 times, leaving a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 23233.25
The remainder is 25 after subtracting 155 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 9:
250 divided by 31 is 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 23233.258
If we subtract 248 from 250, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
31 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 23233.258
If we take 0 away from 20, we end up 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.

Let's proceed to step 11:
31 can be fit into 200 6 times, resulting in a remainder of 14.
The next digit of our result is 6. 
Result so far: 23233.25806
If we take 186 away from 200, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 12:
140 divided by 31 is 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 23233.258064
Subtracting 124 from 140 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 13:
160 divided by 31 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 23233.2580645
Subtracting 155 from 160 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 14:
31 can be fit into 50 1 times, resulting in a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 23233.25806451
The remainder is 19 after subtracting 31 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final result is 23233.25806451 with a remainder of 1.9e-08.