We're dividing 279544 by 90 
The aim is to understand the frequency of 90 in 279544.

Let's proceed to step 1:
If we divide 2 by 90, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (7) from the dividend to 2 and continue with: 27 / 90

Going ahead to step 2:
If we divide 27 by 90, we get 0 and a remainder of 27.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 27 and we're left with 27.
Append the next digit (9) from the dividend to 27 and continue with: 279 / 90

Going ahead to step 3:
279 divided by 90 is 3 with a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we subtract 270 from 279, we get 9.
Take the next digit (5) from the dividend and append it to 9, then repeat: 95 / 90

Moving on to step 4:
95 divided by 90 is 1 with a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 31.0
Subtract 90 from 95 to get 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 90

Moving on to step 5:
90 can be fit into 54 0 times, resulting in a remainder of 54.
The next digit of our result is 0. 
Result so far: 310.0
Deduct 0 from 54 and we're left with 54.
Grab the next digit (4) from the dividend, add it to 54, then carry on: 544 / 90

On to step 6:
When dividing 544 by 90, we get 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 3106.0
Deduct 540 from 544 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
When dividing 40 by 90, we get 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 3106.0
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
90 can be fit into 400 4 times, resulting in a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 3106.04
Deduct 360 from 400 and we're left 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.

Going ahead to step 9:
If we divide 400 by 90, we get 4 and a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 3106.044
Subtract 360 from 400 to 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.

The quotient of the division is 3106.044, and the remainder is 0.004.