We look at the division of 19398090 by 558 
The aim is to understand the frequency of 558 in 19398090.

On to step 1:
1 divided by 558 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 558

Step 2:
19 divided by 558 is 0 with a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 19 to get 19.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 558

Advancing to step 3:
193 divided by 558 is 0 with a remainder of 193.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 193 and we're left with 193.
Include the next digit (9) from the dividend after 193, then repeat: 1939 / 558

Advancing to step 4:
The number 558 fits into 1939 3 times, leaving a remainder of 265.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 265 after subtracting 1674 from 1939.
Append the next digit (8) from the dividend to 265 and continue with: 2658 / 558

Let's proceed to step 5:
When dividing 2658 by 558, we get 4 with a remainder of 426.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we subtract 2232 from 2658, we get 426.
Grab the next digit (0) from the dividend, add it to 426, then carry on: 4260 / 558

Moving on to step 6:
The number 558 fits into 4260 7 times, leaving a remainder of 354.
Put 7 as the next digit of the answer. 
Result so far: 347.0
The remainder is 354 after subtracting 3906 from 4260.
Take the next digit (9) from the dividend and append it to 354, then repeat: 3549 / 558

Going ahead to step 7:
When dividing 3549 by 558, we get 6 with a remainder of 201.
The next digit of our result is 6. 
Result so far: 3476.0
If we subtract 3348 from 3549, we get 201.
Append the next digit (0) from the dividend to 201 and continue with: 2010 / 558

On to step 8:
2010 divided by 558 is 3 with a remainder of 336.
Record the quotient 3 as the next digit in the result. 
Result so far: 34763.0
The remainder is 336 after subtracting 1674 from 2010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Step 9:
558 goes into 3360 6 times with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 34763.6
If we take 3348 away from 3360, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 10:
558 can be fit into 120 0 times, resulting in a remainder of 120.
The number 0 becomes the next digit in our result. 
Result so far: 34763.6
If we take 0 away from 120, we end up with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 11:
The number 558 fits into 1200 2 times, leaving a remainder of 84.
The next digit of our result is 2. 
Result so far: 34763.602
If we subtract 1116 from 1200, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 12:
The number 558 fits into 840 1 times, leaving a remainder of 282.
The next digit of our result is 1. 
Result so far: 34763.6021
Subtracting 558 from 840 leaves us with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

On to step 13:
558 goes into 2820 5 times with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 34763.60215
If we take 2790 away from 2820, 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.

Going ahead to step 14:
300 divided by 558 is 0 with a remainder of 300.
Record the quotient 0 as the next digit in the result. 
Result so far: 34763.60215
If we subtract 0 from 300, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 15:
If we divide 3000 by 558, we get 5 and a remainder of 210.
Put 5 as the next digit of the answer. 
Result so far: 34763.6021505
Subtracting 2790 from 3000 leaves us with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

On to step 16:
2100 divided by 558 is 3 with a remainder of 426.
Use 3 as the next digit of our solution. 
Result so far: 34763.60215053
If we take 1674 away from 2100, we end up with 426.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4260, and continue the process.

The quotient of the division is 34763.60215053, and the remainder is 4.26e-07.