We look at the division of 7941941 by 251 
The aim is to understand the frequency of 251 in 7941941.

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

On to step 2:
When dividing 79 by 251, we get 0 with a remainder of 79.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 79 after subtracting 0 from 79.
Grab the next digit (4) from the dividend, add it to 79, then carry on: 794 / 251

Step 3:
When dividing 794 by 251, we get 3 with a remainder of 41.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 41 after subtracting 753 from 794.
Grab the next digit (1) from the dividend, add it to 41, then carry on: 411 / 251

Advancing to step 4:
251 can be fit into 411 1 times, resulting in a remainder of 160.
Use 1 as the next digit of our solution. 
Result so far: 31.0
Subtracting 251 from 411 leaves us with 160.
Fetch the next digit (9) from the dividend, attach it to 160 and continue: 1609 / 251

Going ahead to step 5:
The number 251 fits into 1609 6 times, leaving a remainder of 103.
Write down 6 as next digit of the result. 
Result so far: 316.0
The remainder is 103 after subtracting 1506 from 1609.
Grab the next digit (4) from the dividend, add it to 103, then carry on: 1034 / 251

Step 6:
The number 251 fits into 1034 4 times, leaving a remainder of 30.
Put 4 as the next digit of the answer. 
Result so far: 3164.0
Deduct 1004 from 1034 and we're left with 30.
Append the next digit (1) from the dividend to 30 and continue with: 301 / 251

On to step 7:
251 can be fit into 301 1 times, resulting in a remainder of 50.
Record the quotient 1 as the next digit in the result. 
Result so far: 31641.0
If we take 251 away from 301, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 8:
If we divide 500 by 251, we get 1 and a remainder of 249.
The next digit of our result is 1. 
Result so far: 31641.1
If we subtract 251 from 500, we get 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

Going ahead to step 9:
2490 divided by 251 is 9 with a remainder of 231.
The next digit of our result is 9. 
Result so far: 31641.19
Subtract 2259 from 2490 to get 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Let's proceed to step 10:
When dividing 2310 by 251, we get 9 with a remainder of 51.
Put 9 as the next digit of the answer. 
Result so far: 31641.199
Deduct 2259 from 2310 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

The quotient of the division is 31641.199, and the remainder is 0.0051.