51839344 divided by 80 
The aim is to understand the frequency of 80 in 51839344.

Step 1:
The number 80 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 80

On to step 2:
80 goes into 51 0 times with a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Append the next digit (8) from the dividend to 51 and continue with: 518 / 80

On to step 3:
The number 80 fits into 518 6 times, leaving a remainder of 38.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtract 480 from 518 to get 38.
Take the next digit (3) from the dividend and append it to 38, then repeat: 383 / 80

Advancing to step 4:
If we divide 383 by 80, we get 4 and a remainder of 63.
The next digit of our result is 4. 
Result so far: 64.0
The remainder is 63 after subtracting 320 from 383.
Fetch the next digit (9) from the dividend, attach it to 63 and continue: 639 / 80

Going ahead to step 5:
639 divided by 80 is 7 with a remainder of 79.
Put 7 as the next digit of the answer. 
Result so far: 647.0
If we take 560 away from 639, we end up with 79.
Grab the next digit (3) from the dividend, add it to 79, then carry on: 793 / 80

Let's proceed to step 6:
If we divide 793 by 80, we get 9 and a remainder of 73.
Record the quotient 9 as the next digit in the result. 
Result so far: 6479.0
Subtract 720 from 793 to get 73.
Include the next digit (4) from the dividend after 73, then repeat: 734 / 80

Step 7:
If we divide 734 by 80, we get 9 and a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 64799.0
Deduct 720 from 734 and we're left with 14.
Append the next digit (4) from the dividend to 14 and continue with: 144 / 80

Step 8:
The number 80 fits into 144 1 times, leaving a remainder of 64.
Use 1 as the next digit of our solution. 
Result so far: 647991.0
If we take 80 away from 144, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 9:
640 divided by 80 is 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 647991.8
If we take 640 away from 640, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 647991.8
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
0 divided by 80 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 647991.8
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 647991.8 with a remainder of 0.0.