1852644 ÷ 423 
The aim is to understand the frequency of 423 in 1852644.

Let's proceed to step 1:
The number 423 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 423

Going ahead to step 2:
423 can be fit into 18 0 times, resulting in a remainder of 18.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 18 and we're left with 18.
Bring next digit (5) of the dividend behind the 18 and repeat the process: 185 / 423

On to step 3:
423 can be fit into 185 0 times, resulting in a remainder of 185.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 185 leaves us with 185.
Bring next digit (2) of the dividend behind the 185 and repeat the process: 1852 / 423

Moving on to step 4:
423 can be fit into 1852 4 times, resulting in a remainder of 160.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 1692 away from 1852, we end up with 160.
Take the next digit (6) from the dividend and append it to 160, then repeat: 1606 / 423

On to step 5:
When dividing 1606 by 423, we get 3 with a remainder of 337.
The next digit of our result is 3. 
Result so far: 43.0
Subtracting 1269 from 1606 leaves us with 337.
Append the next digit (4) from the dividend to 337 and continue with: 3374 / 423

Moving on to step 6:
3374 divided by 423 is 7 with a remainder of 413.
Use 7 as the next digit of our solution. 
Result so far: 437.0
If we take 2961 away from 3374, we end up with 413.
Grab the next digit (4) from the dividend, add it to 413, then carry on: 4134 / 423

Moving on to step 7:
When dividing 4134 by 423, we get 9 with a remainder of 327.
Put 9 as the next digit of the answer. 
Result so far: 4379.0
If we subtract 3807 from 4134, we get 327.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3270, and continue the process.

Let's proceed to step 8:
If we divide 3270 by 423, we get 7 and a remainder of 309.
Put 7 as the next digit of the answer. 
Result so far: 4379.7
If we take 2961 away from 3270, we end up with 309.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3090, and continue the process.

Going ahead to step 9:
When dividing 3090 by 423, we get 7 with a remainder of 129.
The next digit of our result is 7. 
Result so far: 4379.77
Deduct 2961 from 3090 and we're left with 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

The final result is 4379.77 with a remainder of 0.129.