We look at the division of 79935556 by 251 
The aim is to understand the frequency of 251 in 79935556.

On to step 1:
7 divided by 251 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 251

Moving on to step 2:
251 goes into 79 0 times with a remainder of 79.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 79 leaves us with 79.
Append the next digit (9) from the dividend to 79 and continue with: 799 / 251

Step 3:
251 can be fit into 799 3 times, resulting in a remainder of 46.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 753 from 799 and we're left with 46.
Take the next digit (3) from the dividend and append it to 46, then repeat: 463 / 251

On to step 4:
When dividing 463 by 251, we get 1 with a remainder of 212.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
Subtracting 251 from 463 leaves us with 212.
Append the next digit (5) from the dividend to 212 and continue with: 2125 / 251

Let's proceed to step 5:
The number 251 fits into 2125 8 times, leaving a remainder of 117.
The number 8 becomes the next digit in our result. 
Result so far: 318.0
Deduct 2008 from 2125 and we're left with 117.
Bring next digit (5) of the dividend behind the 117 and repeat the process: 1175 / 251

Advancing to step 6:
The number 251 fits into 1175 4 times, leaving a remainder of 171.
The number 4 becomes the next digit in our result. 
Result so far: 3184.0
Deduct 1004 from 1175 and we're left with 171.
Include the next digit (5) from the dividend after 171, then repeat: 1715 / 251

Going ahead to step 7:
251 goes into 1715 6 times with a remainder of 209.
The next digit of our result is 6. 
Result so far: 31846.0
The remainder is 209 after subtracting 1506 from 1715.
Include the next digit (6) from the dividend after 209, then repeat: 2096 / 251

Step 8:
251 can be fit into 2096 8 times, resulting in a remainder of 88.
The next digit of our result is 8. 
Result so far: 318468.0
If we subtract 2008 from 2096, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

On to step 9:
The number 251 fits into 880 3 times, leaving a remainder of 127.
The number 3 becomes the next digit in our result. 
Result so far: 318468.3
Subtract 753 from 880 to get 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Moving on to step 10:
1270 divided by 251 is 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 318468.35
If we take 1255 away from 1270, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 11:
251 can be fit into 150 0 times, resulting in a remainder of 150.
The next digit of our result is 0. 
Result so far: 318468.35
Deduct 0 from 150 and we're left with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Advancing to step 12:
If we divide 1500 by 251, we get 5 and a remainder of 245.
Record the quotient 5 as the next digit in the result. 
Result so far: 318468.3505
If we take 1255 away from 1500, we end up with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Going ahead to step 13:
When dividing 2450 by 251, we get 9 with a remainder of 191.
Write down 9 as next digit of the result. 
Result so far: 318468.35059
Deduct 2259 from 2450 and we're left with 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1910, and continue the process.

On to step 14:
251 goes into 1910 7 times with a remainder of 153.
Record the quotient 7 as the next digit in the result. 
Result so far: 318468.350597
The remainder is 153 after subtracting 1757 from 1910.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

Let's proceed to step 15:
The number 251 fits into 1530 6 times, leaving a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 318468.3505976
If we subtract 1506 from 1530, we 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.

Let's proceed to step 16:
240 divided by 251 is 0 with a remainder of 240.
Record the quotient 0 as the next digit in the result. 
Result so far: 318468.3505976
Subtract 0 from 240 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The final result is 318468.3505976 with a remainder of 2.4e-07.