81563700 divided by 280 
The aim is to understand the frequency of 280 in 81563700.

Advancing to step 1:
When dividing 8 by 280, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 280

Moving on to step 2:
When dividing 81 by 280, we get 0 with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Bring next digit (5) of the dividend behind the 81 and repeat the process: 815 / 280

On to step 3:
280 can be fit into 815 2 times, resulting in a remainder of 255.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 255 after subtracting 560 from 815.
Bring next digit (6) of the dividend behind the 255 and repeat the process: 2556 / 280

Advancing to step 4:
If we divide 2556 by 280, we get 9 and a remainder of 36.
Record the quotient 9 as the next digit in the result. 
Result so far: 29.0
If we take 2520 away from 2556, we end up with 36.
Append the next digit (3) from the dividend to 36 and continue with: 363 / 280

Step 5:
363 divided by 280 is 1 with a remainder of 83.
Use 1 as the next digit of our solution. 
Result so far: 291.0
Deduct 280 from 363 and we're left with 83.
Take the next digit (7) from the dividend and append it to 83, then repeat: 837 / 280

Step 6:
When dividing 837 by 280, we get 2 with a remainder of 277.
The number 2 becomes the next digit in our result. 
Result so far: 2912.0
Deduct 560 from 837 and we're left with 277.
Append the next digit (0) from the dividend to 277 and continue with: 2770 / 280

Advancing to step 7:
The number 280 fits into 2770 9 times, leaving a remainder of 250.
Put 9 as the next digit of the answer. 
Result so far: 29129.0
Deduct 2520 from 2770 and we're left with 250.
Bring next digit (0) of the dividend behind the 250 and repeat the process: 2500 / 280

Moving on to step 8:
The number 280 fits into 2500 8 times, leaving a remainder of 260.
Write down 8 as next digit of the result. 
Result so far: 291298.0
If we take 2240 away from 2500, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 9:
When dividing 2600 by 280, we get 9 with a remainder of 80.
Record the quotient 9 as the next digit in the result. 
Result so far: 291298.9
If we subtract 2520 from 2600, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 10:
800 divided by 280 is 2 with a remainder of 240.
Put 2 as the next digit of the answer. 
Result so far: 291298.92
If we take 560 away from 800, we end up with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 11:
2400 divided by 280 is 8 with a remainder of 160.
The number 8 becomes the next digit in our result. 
Result so far: 291298.928
Subtracting 2240 from 2400 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 12:
1600 divided by 280 is 5 with a remainder of 200.
Record the quotient 5 as the next digit in the result. 
Result so far: 291298.9285
Deduct 1400 from 1600 and we're left 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.

Moving on to step 13:
The number 280 fits into 2000 7 times, leaving a remainder of 40.
Put 7 as the next digit of the answer. 
Result so far: 291298.92857
The remainder is 40 after subtracting 1960 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 14:
400 divided by 280 is 1 with a remainder of 120.
Write down 1 as next digit of the result. 
Result so far: 291298.928571
If we take 280 away from 400, we end up with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 15:
280 can be fit into 1200 4 times, resulting in a remainder of 80.
Use 4 as the next digit of our solution. 
Result so far: 291298.9285714
If we take 1120 away from 1200, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 16:
If we divide 800 by 280, we get 2 and a remainder of 240.
Use 2 as the next digit of our solution. 
Result so far: 291298.92857142
Deduct 560 from 800 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The final result is 291298.92857142 with a remainder of 2.4e-07.