We're dividing 20406018 by 251 
The aim is to understand the frequency of 251 in 20406018.

Step 1:
251 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 251

Moving on to step 2:
The number 251 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 251

On to step 3:
When dividing 204 by 251, we get 0 with a remainder of 204.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 204, we get 204.
Append the next digit (0) from the dividend to 204 and continue with: 2040 / 251

Moving on to step 4:
251 can be fit into 2040 8 times, resulting in a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 2008 from 2040 and we're left with 32.
Grab the next digit (6) from the dividend, add it to 32, then carry on: 326 / 251

Advancing to step 5:
251 goes into 326 1 times with a remainder of 75.
Put 1 as the next digit of the answer. 
Result so far: 81.0
If we subtract 251 from 326, we get 75.
Include the next digit (0) from the dividend after 75, then repeat: 750 / 251

Moving on to step 6:
When dividing 750 by 251, we get 2 with a remainder of 248.
The next digit of our result is 2. 
Result so far: 812.0
If we take 502 away from 750, we end up with 248.
Include the next digit (1) from the dividend after 248, then repeat: 2481 / 251

On to step 7:
The number 251 fits into 2481 9 times, leaving a remainder of 222.
Write down 9 as next digit of the result. 
Result so far: 8129.0
Subtracting 2259 from 2481 leaves us with 222.
Bring next digit (8) of the dividend behind the 222 and repeat the process: 2228 / 251

Step 8:
If we divide 2228 by 251, we get 8 and a remainder of 220.
Write down 8 as next digit of the result. 
Result so far: 81298.0
Deduct 2008 from 2228 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Moving on to step 9:
251 goes into 2200 8 times with a remainder of 192.
The number 8 becomes the next digit in our result. 
Result so far: 81298.8
The remainder is 192 after subtracting 2008 from 2200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Advancing to step 10:
251 can be fit into 1920 7 times, resulting in a remainder of 163.
Use 7 as the next digit of our solution. 
Result so far: 81298.87
Subtracting 1757 from 1920 leaves us with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Going ahead to step 11:
When dividing 1630 by 251, we get 6 with a remainder of 124.
Write down 6 as next digit of the result. 
Result so far: 81298.876
The remainder is 124 after subtracting 1506 from 1630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Let's proceed to step 12:
251 can be fit into 1240 4 times, resulting in a remainder of 236.
Write down 4 as next digit of the result. 
Result so far: 81298.8764
If we take 1004 away from 1240, we end up with 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Advancing to step 13:
251 goes into 2360 9 times with a remainder of 101.
Use 9 as the next digit of our solution. 
Result so far: 81298.87649
Subtracting 2259 from 2360 leaves us with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Let's proceed to step 14:
251 can be fit into 1010 4 times, resulting in a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 81298.876494
If we subtract 1004 from 1010, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 15:
60 divided by 251 is 0 with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 81298.876494
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 16:
If we divide 600 by 251, we get 2 and a remainder of 98.
Record the quotient 2 as the next digit in the result. 
Result so far: 81298.87649402
The remainder is 98 after subtracting 502 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

The quotient of the division is 81298.87649402, and the remainder is 9.8e-08.