51376525 ÷ 781 
The aim is to understand the frequency of 781 in 51376525.

Going ahead to step 1:
5 divided by 781 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 781

Step 2:
51 divided by 781 is 0 with a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Append the next digit (3) from the dividend to 51 and continue with: 513 / 781

On to step 3:
781 can be fit into 513 0 times, resulting in a remainder of 513.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 513 to get 513.
Include the next digit (7) from the dividend after 513, then repeat: 5137 / 781

Let's proceed to step 4:
5137 divided by 781 is 6 with a remainder of 451.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we subtract 4686 from 5137, we get 451.
Fetch the next digit (6) from the dividend, attach it to 451 and continue: 4516 / 781

Let's proceed to step 5:
The number 781 fits into 4516 5 times, leaving a remainder of 611.
Use 5 as the next digit of our solution. 
Result so far: 65.0
If we take 3905 away from 4516, we end up with 611.
Include the next digit (5) from the dividend after 611, then repeat: 6115 / 781

On to step 6:
When dividing 6115 by 781, we get 7 with a remainder of 648.
The next digit of our result is 7. 
Result so far: 657.0
If we take 5467 away from 6115, we end up with 648.
Append the next digit (2) from the dividend to 648 and continue with: 6482 / 781

Let's proceed to step 7:
If we divide 6482 by 781, we get 8 and a remainder of 234.
Use 8 as the next digit of our solution. 
Result so far: 6578.0
If we take 6248 away from 6482, we end up with 234.
Bring next digit (5) of the dividend behind the 234 and repeat the process: 2345 / 781

Advancing to step 8:
When dividing 2345 by 781, we get 3 with a remainder of 2.
The next digit of our result is 3. 
Result so far: 65783.0
Subtracting 2343 from 2345 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 9:
781 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 65783.0
If we subtract 0 from 20, we 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.

Moving on to step 10:
If we divide 200 by 781, we get 0 and a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 65783.0
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final result is 65783.0 with a remainder of 0.2.