51053003 divided by 31 
The aim is to understand the frequency of 31 in 51053003.

Step 1:
When dividing 5 by 31, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 31

Going ahead to step 2:
The number 31 fits into 51 1 times, leaving a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 20 after subtracting 31 from 51.
Fetch the next digit (0) from the dividend, attach it to 20 and continue: 200 / 31

Advancing to step 3:
If we divide 200 by 31, we get 6 and a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 16.0
The remainder is 14 after subtracting 186 from 200.
Take the next digit (5) from the dividend and append it to 14, then repeat: 145 / 31

On to step 4:
145 divided by 31 is 4 with a remainder of 21.
Put 4 as the next digit of the answer. 
Result so far: 164.0
Subtracting 124 from 145 leaves us with 21.
Bring next digit (3) of the dividend behind the 21 and repeat the process: 213 / 31

On to step 5:
213 divided by 31 is 6 with a remainder of 27.
Use 6 as the next digit of our solution. 
Result so far: 1646.0
If we take 186 away from 213, we end up with 27.
Fetch the next digit (0) from the dividend, attach it to 27 and continue: 270 / 31

Step 6:
270 divided by 31 is 8 with a remainder of 22.
Record the quotient 8 as the next digit in the result. 
Result so far: 16468.0
If we subtract 248 from 270, we get 22.
Append the next digit (0) from the dividend to 22 and continue with: 220 / 31

Advancing to step 7:
When dividing 220 by 31, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 164687.0
Subtract 217 from 220 to get 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 31

Step 8:
31 goes into 33 1 times with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1646871.0
Subtract 31 from 33 to 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.

Going ahead to step 9:
20 divided by 31 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 1646871.0
Subtract 0 from 20 to get 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 10:
The number 31 fits into 200 6 times, leaving a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 1646871.06
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.

Moving on to step 11:
When dividing 140 by 31, we get 4 with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 1646871.064
If we subtract 124 from 140, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 12:
31 goes into 160 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 1646871.0645
The remainder is 5 after subtracting 155 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 13:
If we divide 50 by 31, we get 1 and a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 1646871.06451
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.

Step 14:
31 can be fit into 190 6 times, resulting in a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 1646871.064516
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.

Advancing to step 15:
When dividing 40 by 31, we get 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 1646871.0645161
The remainder is 9 after subtracting 31 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 16:
When dividing 90 by 31, we get 2 with a remainder of 28.
The next digit of our result is 2. 
Result so far: 1646871.06451612
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.

The final result is 1646871.06451612 with a remainder of 2.8e-08.