126019 ÷ 75 
The aim is to understand the frequency of 75 in 126019.

Going ahead to step 1:
When dividing 1 by 75, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 75

Let's proceed to step 2:
12 divided by 75 is 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Append the next digit (6) from the dividend to 12 and continue with: 126 / 75

Going ahead to step 3:
When dividing 126 by 75, we get 1 with a remainder of 51.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 75 from 126 leaves us with 51.
Fetch the next digit (0) from the dividend, attach it to 51 and continue: 510 / 75

On to step 4:
If we divide 510 by 75, we get 6 and a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Subtract 450 from 510 to get 60.
Include the next digit (1) from the dividend after 60, then repeat: 601 / 75

Let's proceed to step 5:
75 can be fit into 601 8 times, resulting in a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 168.0
If we subtract 600 from 601, we get 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 75

Step 6:
The number 75 fits into 19 0 times, leaving a remainder of 19.
The next digit of our result is 0. 
Result so far: 1680.0
If we take 0 away from 19, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
75 goes into 190 2 times with a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 1680.2
Deduct 150 from 190 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.

Moving on to step 8:
When dividing 400 by 75, we get 5 with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 1680.25
Deduct 375 from 400 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 9:
75 can be fit into 250 3 times, resulting in a remainder of 25.
Write down 3 as next digit of the result. 
Result so far: 1680.253
The remainder is 25 after subtracting 225 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 10:
75 goes into 250 3 times with a remainder of 25.
The next digit of our result is 3. 
Result so far: 1680.2533
If we subtract 225 from 250, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Our division results in 1680.2533 with a remaining 0.00025.