We look at the division of 57107981 by 7 
The aim is to understand the frequency of 7 in 57107981.

Moving on to step 1:
7 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 7

Going ahead to step 2:
The number 7 fits into 57 8 times, leaving a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtract 56 from 57 to get 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 7

Moving on to step 3:
7 can be fit into 11 1 times, resulting in a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
Subtract 7 from 11 to get 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 7

Advancing to step 4:
If we divide 40 by 7, we get 5 and a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 815.0
The remainder is 5 after subtracting 35 from 40.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 7

Moving on to step 5:
If we divide 57 by 7, we get 8 and a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 8158.0
Subtracting 56 from 57 leaves us with 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 7

Step 6:
The number 7 fits into 19 2 times, leaving a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 81582.0
Subtract 14 from 19 to get 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 7

Let's proceed to step 7:
When dividing 58 by 7, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 815828.0
Deduct 56 from 58 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 7

Let's proceed to step 8:
7 goes into 21 3 times with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 8158283.0
Subtract 21 from 21 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
0 divided by 7 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8158283.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 10:
If we divide 0 by 7, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8158283.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 8158283.0 and a remainder of 0.0.