We divide 21043947 by 90
The aim is to understand the frequency of 90 in 21043947.

Advancing to step 1:
If we divide 2 by 90, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 90

Step 2:
90 can be fit into 21 0 times, resulting in a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 90

Let's proceed to step 3:
90 can be fit into 210 2 times, resulting in a remainder of 30.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 180 from 210 and we're left with 30.
Include the next digit (4) from the dividend after 30, then repeat: 304 / 90

Advancing to step 4:
90 goes into 304 3 times with a remainder of 34.
Write down 3 as next digit of the result. 
Result so far: 23.0
Subtracting 270 from 304 leaves us with 34.
Fetch the next digit (3) from the dividend, attach it to 34 and continue: 343 / 90

Step 5:
90 can be fit into 343 3 times, resulting in a remainder of 73.
Write down 3 as next digit of the result. 
Result so far: 233.0
If we subtract 270 from 343, we get 73.
Fetch the next digit (9) from the dividend, attach it to 73 and continue: 739 / 90

Advancing to step 6:
The number 90 fits into 739 8 times, leaving a remainder of 19.
Use 8 as the next digit of our solution. 
Result so far: 2338.0
If we subtract 720 from 739, we get 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 90

Let's proceed to step 7:
The number 90 fits into 194 2 times, leaving a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 23382.0
If we take 180 away from 194, we end up with 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 90

Moving on to step 8:
When dividing 147 by 90, we get 1 with a remainder of 57.
Record the quotient 1 as the next digit in the result. 
Result so far: 233821.0
The remainder is 57 after subtracting 90 from 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 9:
The number 90 fits into 570 6 times, leaving a remainder of 30.
The number 6 becomes the next digit in our result. 
Result so far: 233821.6
Deduct 540 from 570 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 10:
When dividing 300 by 90, we get 3 with a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 233821.63
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 11:
The number 90 fits into 300 3 times, leaving a remainder of 30.
The next digit of our result is 3. 
Result so far: 233821.633
Subtract 270 from 300 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Our division results in 233821.633 with a remaining 0.003.