Let's divide 280786 by 90
The aim is to understand the frequency of 90 in 280786.

Step 1:
90 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 90

Let's proceed to step 2:
When dividing 28 by 90, we get 0 with a remainder of 28.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 28, we end up with 28.
Fetch the next digit (0) from the dividend, attach it to 28 and continue: 280 / 90

On to step 3:
90 can be fit into 280 3 times, resulting in a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 270 away from 280, we end up with 10.
Grab the next digit (7) from the dividend, add it to 10, then carry on: 107 / 90

Moving on to step 4:
107 divided by 90 is 1 with a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 31.0
If we take 90 away from 107, we end up with 17.
Append the next digit (8) from the dividend to 17 and continue with: 178 / 90

Step 5:
90 goes into 178 1 times with a remainder of 88.
Write down 1 as next digit of the result. 
Result so far: 311.0
The remainder is 88 after subtracting 90 from 178.
Append the next digit (6) from the dividend to 88 and continue with: 886 / 90

Step 6:
The number 90 fits into 886 9 times, leaving a remainder of 76.
Record the quotient 9 as the next digit in the result. 
Result so far: 3119.0
Deduct 810 from 886 and we're left 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.

Step 7:
When dividing 760 by 90, we get 8 with a remainder of 40.
Record the quotient 8 as the next digit in the result. 
Result so far: 3119.8
If we subtract 720 from 760, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 8:
The number 90 fits into 400 4 times, leaving a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 3119.84
If we take 360 away from 400, 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.

Step 9:
90 goes into 400 4 times with a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 3119.844
The remainder is 40 after subtracting 360 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The quotient of the division is 3119.844, and the remainder is 0.004.