266088 ÷ 51 
The aim is to understand the frequency of 51 in 266088.

Step 1:
When dividing 2 by 51, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 51

Going ahead to step 2:
26 divided by 51 is 0 with a remainder of 26.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 26 leaves us with 26.
Include the next digit (6) from the dividend after 26, then repeat: 266 / 51

Step 3:
The number 51 fits into 266 5 times, leaving a remainder of 11.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we subtract 255 from 266, we get 11.
Bring next digit (0) of the dividend behind the 11 and repeat the process: 110 / 51

Going ahead to step 4:
When dividing 110 by 51, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 52.0
Subtracting 102 from 110 leaves us with 8.
Include the next digit (8) from the dividend after 8, then repeat: 88 / 51

Step 5:
When dividing 88 by 51, we get 1 with a remainder of 37.
Record the quotient 1 as the next digit in the result. 
Result so far: 521.0
Deduct 51 from 88 and we're left with 37.
Append the next digit (8) from the dividend to 37 and continue with: 378 / 51

Step 6:
51 goes into 378 7 times with a remainder of 21.
The next digit of our result is 7. 
Result so far: 5217.0
Subtract 357 from 378 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 7:
If we divide 210 by 51, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 5217.4
Deduct 204 from 210 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
The number 51 fits into 60 1 times, leaving a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 5217.41
The remainder is 9 after subtracting 51 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 9:
90 divided by 51 is 1 with a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 5217.411
Deduct 51 from 90 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The quotient of the division is 5217.411, and the remainder is 0.0039.