961580 ÷ 51 
The aim is to understand the frequency of 51 in 961580.

Moving on to step 1:
If we divide 9 by 51, we get 0 and a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 51

Advancing to step 2:
51 goes into 96 1 times with a remainder of 45.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 51 from 96, we get 45.
Fetch the next digit (1) from the dividend, attach it to 45 and continue: 451 / 51

Let's proceed to step 3:
When dividing 451 by 51, we get 8 with a remainder of 43.
Use 8 as the next digit of our solution. 
Result so far: 18.0
If we subtract 408 from 451, we get 43.
Include the next digit (5) from the dividend after 43, then repeat: 435 / 51

Advancing to step 4:
When dividing 435 by 51, we get 8 with a remainder of 27.
Use 8 as the next digit of our solution. 
Result so far: 188.0
Subtracting 408 from 435 leaves us with 27.
Fetch the next digit (8) from the dividend, attach it to 27 and continue: 278 / 51

Step 5:
The number 51 fits into 278 5 times, leaving a remainder of 23.
Use 5 as the next digit of our solution. 
Result so far: 1885.0
Subtract 255 from 278 to get 23.
Fetch the next digit (0) from the dividend, attach it to 23 and continue: 230 / 51

Going ahead to step 6:
When dividing 230 by 51, we get 4 with a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 18854.0
The remainder is 26 after subtracting 204 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 7:
If we divide 260 by 51, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 18854.5
Subtract 255 from 260 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 8:
51 goes into 50 0 times with a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 18854.5
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
500 divided by 51 is 9 with a remainder of 41.
The next digit of our result is 9. 
Result so far: 18854.509
If we take 459 away from 500, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 10:
When dividing 410 by 51, we get 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 18854.5098
If we subtract 408 from 410, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 11:
The number 51 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 18854.5098
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 12:
51 can be fit into 200 3 times, resulting in a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 18854.509803
The remainder is 47 after subtracting 153 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 13:
When dividing 470 by 51, we get 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 18854.5098039
Subtract 459 from 470 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 14:
When dividing 110 by 51, we get 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 18854.50980392
If we take 102 away from 110, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 18854.50980392, with a leftover of 8e-09.