Let's divide 15421003 by 585
The aim is to understand the frequency of 585 in 15421003.

Moving on to step 1:
585 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 585

On to step 2:
585 goes into 15 0 times with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Bring next digit (4) of the dividend behind the 15 and repeat the process: 154 / 585

Let's proceed to step 3:
If we divide 154 by 585, we get 0 and a remainder of 154.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 154 leaves us with 154.
Fetch the next digit (2) from the dividend, attach it to 154 and continue: 1542 / 585

Advancing to step 4:
The number 585 fits into 1542 2 times, leaving a remainder of 372.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 1170 from 1542, we get 372.
Append the next digit (1) from the dividend to 372 and continue with: 3721 / 585

Moving on to step 5:
If we divide 3721 by 585, we get 6 and a remainder of 211.
Put 6 as the next digit of the answer. 
Result so far: 26.0
If we subtract 3510 from 3721, we get 211.
Fetch the next digit (0) from the dividend, attach it to 211 and continue: 2110 / 585

Going ahead to step 6:
When dividing 2110 by 585, we get 3 with a remainder of 355.
Write down 3 as next digit of the result. 
Result so far: 263.0
If we subtract 1755 from 2110, we get 355.
Include the next digit (0) from the dividend after 355, then repeat: 3550 / 585

Moving on to step 7:
585 can be fit into 3550 6 times, resulting in a remainder of 40.
The next digit of our result is 6. 
Result so far: 2636.0
Subtracting 3510 from 3550 leaves us with 40.
Grab the next digit (3) from the dividend, add it to 40, then carry on: 403 / 585

On to step 8:
403 divided by 585 is 0 with a remainder of 403.
The next digit of our result is 0. 
Result so far: 26360.0
Deduct 0 from 403 and we're left with 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

Advancing to step 9:
When dividing 4030 by 585, we get 6 with a remainder of 520.
Put 6 as the next digit of the answer. 
Result so far: 26360.6
Subtracting 3510 from 4030 leaves us with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Step 10:
When dividing 5200 by 585, we get 8 with a remainder of 520.
Write down 8 as next digit of the result. 
Result so far: 26360.68
If we subtract 4680 from 5200, we get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Step 11:
The number 585 fits into 5200 8 times, leaving a remainder of 520.
The number 8 becomes the next digit in our result. 
Result so far: 26360.688
Subtracting 4680 from 5200 leaves us with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

The final outcome is 26360.688, with a leftover of 0.052.