972800 ÷ 31 
The aim is to understand the frequency of 31 in 972800.

Going ahead to step 1:
31 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (7) from the dividend after 9, then repeat: 97 / 31

Let's proceed to step 2:
31 goes into 97 3 times with a remainder of 4.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 93 from 97 to get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 31

Going ahead to step 3:
The number 31 fits into 42 1 times, leaving a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
The remainder is 11 after subtracting 31 from 42.
Bring next digit (8) of the dividend behind the 11 and repeat the process: 118 / 31

Let's proceed to step 4:
31 goes into 118 3 times with a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 313.0
Deduct 93 from 118 and we're left with 25.
Grab the next digit (0) from the dividend, add it to 25, then carry on: 250 / 31

Step 5:
When dividing 250 by 31, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 3138.0
Subtract 248 from 250 to get 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 31

Moving on to step 6:
31 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 31380.0
Subtracting 0 from 20 leaves us 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.

On to step 7:
When dividing 200 by 31, we get 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 31380.6
Subtract 186 from 200 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 8:
31 goes into 140 4 times with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 31380.64
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 9:
160 divided by 31 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 31380.645
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.

Step 10:
31 goes into 50 1 times with a remainder of 19.
The next digit of our result is 1. 
Result so far: 31380.6451
If we subtract 31 from 50, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 11:
31 goes into 190 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 31380.64516
If we take 186 away from 190, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 12:
31 goes into 40 1 times with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 31380.645161
If we take 31 away from 40, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 13:
The number 31 fits into 90 2 times, leaving a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 31380.6451612
Deduct 62 from 90 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 14:
The number 31 fits into 280 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 31380.64516129
Subtract 279 from 280 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 31380.64516129 with a remainder of 1e-09.