663436 ÷ 31 
The aim is to understand the frequency of 31 in 663436.

Advancing to step 1:
31 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 31

On to step 2:
The number 31 fits into 66 2 times, leaving a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 62 from 66 and we're left with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 31

Moving on to step 3:
If we divide 43 by 31, we get 1 and a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we subtract 31 from 43, we get 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 31

Going ahead to step 4:
If we divide 124 by 31, we get 4 and a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 214.0
The remainder is 0 after subtracting 124 from 124.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 31

Going ahead to step 5:
If we divide 3 by 31, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 2140.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 31

Let's proceed to step 6:
When dividing 36 by 31, we get 1 with a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 21401.0
Subtracting 31 from 36 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 7:
When dividing 50 by 31, we get 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 21401.1
Subtracting 31 from 50 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 8:
31 goes into 190 6 times with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 21401.16
Subtracting 186 from 190 leaves us 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.

Step 9:
31 can be fit into 40 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 21401.161
If we subtract 31 from 40, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 10:
The number 31 fits into 90 2 times, leaving a remainder of 28.
The next digit of our result is 2. 
Result so far: 21401.1612
The remainder is 28 after subtracting 62 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 11:
31 can be fit into 280 9 times, resulting in a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 21401.16129
If we take 279 away from 280, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 12:
31 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 21401.16129
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 13:
31 goes into 100 3 times with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 21401.1612903
If we take 93 away from 100, we end up 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.

Let's proceed to step 14:
70 divided by 31 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 21401.16129032
Subtract 62 from 70 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 21401.16129032, with a leftover of 8e-09.