We look at the division of 82163521 by 280 
The aim is to understand the frequency of 280 in 82163521.

On to step 1:
If we divide 8 by 280, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (2) from the dividend after 8, then repeat: 82 / 280

Going ahead to step 2:
If we divide 82 by 280, we get 0 and a remainder of 82.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 82 and we're left with 82.
Append the next digit (1) from the dividend to 82 and continue with: 821 / 280

Step 3:
280 can be fit into 821 2 times, resulting in a remainder of 261.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 560 from 821 to get 261.
Fetch the next digit (6) from the dividend, attach it to 261 and continue: 2616 / 280

On to step 4:
The number 280 fits into 2616 9 times, leaving a remainder of 96.
The next digit of our result is 9. 
Result so far: 29.0
Subtract 2520 from 2616 to get 96.
Fetch the next digit (3) from the dividend, attach it to 96 and continue: 963 / 280

Moving on to step 5:
280 can be fit into 963 3 times, resulting in a remainder of 123.
Write down 3 as next digit of the result. 
Result so far: 293.0
Deduct 840 from 963 and we're left with 123.
Take the next digit (5) from the dividend and append it to 123, then repeat: 1235 / 280

Advancing to step 6:
The number 280 fits into 1235 4 times, leaving a remainder of 115.
Put 4 as the next digit of the answer. 
Result so far: 2934.0
Subtract 1120 from 1235 to get 115.
Fetch the next digit (2) from the dividend, attach it to 115 and continue: 1152 / 280

Advancing to step 7:
1152 divided by 280 is 4 with a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 29344.0
If we subtract 1120 from 1152, we get 32.
Bring next digit (1) of the dividend behind the 32 and repeat the process: 321 / 280

On to step 8:
280 can be fit into 321 1 times, resulting in a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 293441.0
The remainder is 41 after subtracting 280 from 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 9:
280 can be fit into 410 1 times, resulting in a remainder of 130.
Record the quotient 1 as the next digit in the result. 
Result so far: 293441.1
The remainder is 130 after subtracting 280 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Moving on to step 10:
280 goes into 1300 4 times with a remainder of 180.
The next digit of our result is 4. 
Result so far: 293441.14
If we subtract 1120 from 1300, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

On to step 11:
If we divide 1800 by 280, we get 6 and a remainder of 120.
The number 6 becomes the next digit in our result. 
Result so far: 293441.146
The remainder is 120 after subtracting 1680 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 12:
280 goes into 1200 4 times with a remainder of 80.
The next digit of our result is 4. 
Result so far: 293441.1464
If we subtract 1120 from 1200, 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.

Moving on to step 13:
800 divided by 280 is 2 with a remainder of 240.
The number 2 becomes the next digit in our result. 
Result so far: 293441.14642
If we subtract 560 from 800, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Advancing to step 14:
2400 divided by 280 is 8 with a remainder of 160.
Use 8 as the next digit of our solution. 
Result so far: 293441.146428
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.

Advancing to step 15:
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: 293441.1464285
The remainder is 200 after subtracting 1400 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 16:
280 goes into 2000 7 times with a remainder of 40.
The next digit of our result is 7. 
Result so far: 293441.14642857
If we take 1960 away from 2000, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Our division results in 293441.14642857 with a remaining 4e-08.