We look at the division of 53649596 by 80 
The aim is to understand the frequency of 80 in 53649596.

On to step 1:
When dividing 5 by 80, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 80

On to step 2:
80 can be fit into 53 0 times, resulting in a remainder of 53.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Append the next digit (6) from the dividend to 53 and continue with: 536 / 80

Advancing to step 3:
If we divide 536 by 80, we get 6 and a remainder of 56.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 480 from 536 leaves us with 56.
Take the next digit (4) from the dividend and append it to 56, then repeat: 564 / 80

On to step 4:
When dividing 564 by 80, we get 7 with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 67.0
Deduct 560 from 564 and we're left with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 80

Advancing to step 5:
80 can be fit into 49 0 times, resulting in a remainder of 49.
Put 0 as the next digit of the answer. 
Result so far: 670.0
If we take 0 away from 49, we end up with 49.
Append the next digit (5) from the dividend to 49 and continue with: 495 / 80

Step 6:
If we divide 495 by 80, we get 6 and a remainder of 15.
Record the quotient 6 as the next digit in the result. 
Result so far: 6706.0
The remainder is 15 after subtracting 480 from 495.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 80

Advancing to step 7:
When dividing 159 by 80, we get 1 with a remainder of 79.
The number 1 becomes the next digit in our result. 
Result so far: 67061.0
Deduct 80 from 159 and we're left with 79.
Bring next digit (6) of the dividend behind the 79 and repeat the process: 796 / 80

Let's proceed to step 8:
The number 80 fits into 796 9 times, leaving a remainder of 76.
The number 9 becomes the next digit in our result. 
Result so far: 670619.0
If we take 720 away from 796, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 9:
When dividing 760 by 80, we get 9 with a remainder of 40.
Record the quotient 9 as the next digit in the result. 
Result so far: 670619.9
The remainder is 40 after subtracting 720 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 10:
400 divided by 80 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 670619.95
Subtracting 400 from 400 leaves us 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 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 670619.95
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.

Advancing to step 12:
0 divided by 80 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 670619.95
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 quotient of the division is 670619.95, and the remainder is 0.0.