21906558 ÷ 558 
The aim is to understand the frequency of 558 in 21906558.

Moving on to step 1:
2 divided by 558 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 558

On to step 2:
558 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Take the next digit (9) from the dividend and append it to 21, then repeat: 219 / 558

Moving on to step 3:
558 goes into 219 0 times with a remainder of 219.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 219 after subtracting 0 from 219.
Include the next digit (0) from the dividend after 219, then repeat: 2190 / 558

On to step 4:
2190 divided by 558 is 3 with a remainder of 516.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 1674 away from 2190, we end up with 516.
Append the next digit (6) from the dividend to 516 and continue with: 5166 / 558

Advancing to step 5:
558 goes into 5166 9 times with a remainder of 144.
Put 9 as the next digit of the answer. 
Result so far: 39.0
The remainder is 144 after subtracting 5022 from 5166.
Append the next digit (5) from the dividend to 144 and continue with: 1445 / 558

On to step 6:
1445 divided by 558 is 2 with a remainder of 329.
The number 2 becomes the next digit in our result. 
Result so far: 392.0
Deduct 1116 from 1445 and we're left with 329.
Fetch the next digit (5) from the dividend, attach it to 329 and continue: 3295 / 558

Advancing to step 7:
558 can be fit into 3295 5 times, resulting in a remainder of 505.
The next digit of our result is 5. 
Result so far: 3925.0
Subtract 2790 from 3295 to get 505.
Include the next digit (8) from the dividend after 505, then repeat: 5058 / 558

Going ahead to step 8:
5058 divided by 558 is 9 with a remainder of 36.
Write down 9 as next digit of the result. 
Result so far: 39259.0
If we take 5022 away from 5058, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 9:
The number 558 fits into 360 0 times, leaving a remainder of 360.
Record the quotient 0 as the next digit in the result. 
Result so far: 39259.0
If we take 0 away from 360, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 10:
When dividing 3600 by 558, we get 6 with a remainder of 252.
Use 6 as the next digit of our solution. 
Result so far: 39259.06
If we subtract 3348 from 3600, we get 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Moving on to step 11:
When dividing 2520 by 558, we get 4 with a remainder of 288.
Put 4 as the next digit of the answer. 
Result so far: 39259.064
Subtracting 2232 from 2520 leaves us with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

On to step 12:
If we divide 2880 by 558, we get 5 and a remainder of 90.
Record the quotient 5 as the next digit in the result. 
Result so far: 39259.0645
The remainder is 90 after subtracting 2790 from 2880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Step 13:
900 divided by 558 is 1 with a remainder of 342.
Use 1 as the next digit of our solution. 
Result so far: 39259.06451
The remainder is 342 after subtracting 558 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Moving on to step 14:
558 can be fit into 3420 6 times, resulting in a remainder of 72.
Record the quotient 6 as the next digit in the result. 
Result so far: 39259.064516
The remainder is 72 after subtracting 3348 from 3420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 15:
558 can be fit into 720 1 times, resulting in a remainder of 162.
Write down 1 as next digit of the result. 
Result so far: 39259.0645161
Deduct 558 from 720 and we're left with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

On to step 16:
When dividing 1620 by 558, we get 2 with a remainder of 504.
The number 2 becomes the next digit in our result. 
Result so far: 39259.06451612
Subtract 1116 from 1620 to get 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

The final outcome is 39259.06451612, with a leftover of 5.04e-07.