720288 ÷ 31 
The aim is to understand the frequency of 31 in 720288.

Going ahead to 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 subtract 0 from 7, we get 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 31

Moving on to step 2:
The number 31 fits into 72 2 times, leaving a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 62 from 72 leaves us with 10.
Take the next digit (0) from the dividend and append it to 10, then repeat: 100 / 31

Advancing to step 3:
When dividing 100 by 31, we get 3 with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 23.0
If we take 93 away from 100, we end up with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 31

Going ahead to step 4:
If we divide 72 by 31, we get 2 and a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 232.0
Subtract 62 from 72 to get 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 31

Let's proceed to step 5:
When dividing 108 by 31, we get 3 with a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 2323.0
The remainder is 15 after subtracting 93 from 108.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 31

Advancing to step 6:
31 can be fit into 158 5 times, resulting in a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 23235.0
Subtracting 155 from 158 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
The number 31 fits into 30 0 times, leaving a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 23235.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
31 can be fit into 300 9 times, resulting in a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 23235.09
If we take 279 away from 300, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 9:
When dividing 210 by 31, we get 6 with a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 23235.096
Subtract 186 from 210 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 10:
31 can be fit into 240 7 times, resulting in a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 23235.0967
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.

Let's proceed to step 11:
31 can be fit into 230 7 times, resulting in a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 23235.09677
Subtract 217 from 230 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

In conclusion, the division gives 23235.09677 with a balance of 1.3e-05.