Let's divide 3138645 by 280
The aim is to understand the frequency of 280 in 3138645.

Step 1:
3 divided by 280 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 280

Advancing to step 2:
31 divided by 280 is 0 with a remainder of 31.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 31, we end up with 31.
Append the next digit (3) from the dividend to 31 and continue with: 313 / 280

Going ahead to step 3:
When dividing 313 by 280, we get 1 with a remainder of 33.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 280 from 313, we get 33.
Append the next digit (8) from the dividend to 33 and continue with: 338 / 280

Moving on to step 4:
When dividing 338 by 280, we get 1 with a remainder of 58.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Subtracting 280 from 338 leaves us with 58.
Take the next digit (6) from the dividend and append it to 58, then repeat: 586 / 280

On to step 5:
If we divide 586 by 280, we get 2 and a remainder of 26.
The next digit of our result is 2. 
Result so far: 112.0
Subtract 560 from 586 to get 26.
Take the next digit (4) from the dividend and append it to 26, then repeat: 264 / 280

Advancing to step 6:
When dividing 264 by 280, we get 0 with a remainder of 264.
Write down 0 as next digit of the result. 
Result so far: 1120.0
If we take 0 away from 264, we end up with 264.
Take the next digit (5) from the dividend and append it to 264, then repeat: 2645 / 280

Advancing to step 7:
If we divide 2645 by 280, we get 9 and a remainder of 125.
Record the quotient 9 as the next digit in the result. 
Result so far: 11209.0
Deduct 2520 from 2645 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Step 8:
If we divide 1250 by 280, we get 4 and a remainder of 130.
Put 4 as the next digit of the answer. 
Result so far: 11209.4
Subtract 1120 from 1250 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 9:
1300 divided by 280 is 4 with a remainder of 180.
The next digit of our result is 4. 
Result so far: 11209.44
Deduct 1120 from 1300 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Our division results in 11209.44 with a remaining 0.18.