841215 divided by 143 
The aim is to understand the frequency of 143 in 841215.

Advancing to step 1:
When dividing 8 by 143, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 143

Going ahead to step 2:
143 goes into 84 0 times with a remainder of 84.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 84 leaves us with 84.
Include the next digit (1) from the dividend after 84, then repeat: 841 / 143

Moving on to step 3:
The number 143 fits into 841 5 times, leaving a remainder of 126.
The next digit of our result is 5. 
Result so far: 5.0
Subtract 715 from 841 to get 126.
Append the next digit (2) from the dividend to 126 and continue with: 1262 / 143

Let's proceed to step 4:
If we divide 1262 by 143, we get 8 and a remainder of 118.
Write down 8 as next digit of the result. 
Result so far: 58.0
The remainder is 118 after subtracting 1144 from 1262.
Grab the next digit (1) from the dividend, add it to 118, then carry on: 1181 / 143

On to step 5:
If we divide 1181 by 143, we get 8 and a remainder of 37.
Write down 8 as next digit of the result. 
Result so far: 588.0
Deduct 1144 from 1181 and we're left with 37.
Fetch the next digit (5) from the dividend, attach it to 37 and continue: 375 / 143

Advancing to step 6:
143 can be fit into 375 2 times, resulting in a remainder of 89.
Use 2 as the next digit of our solution. 
Result so far: 5882.0
If we take 286 away from 375, we end up with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Let's proceed to step 7:
890 divided by 143 is 6 with a remainder of 32.
The next digit of our result is 6. 
Result so far: 5882.6
Subtract 858 from 890 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 8:
The number 143 fits into 320 2 times, leaving a remainder of 34.
The next digit of our result is 2. 
Result so far: 5882.62
If we take 286 away from 320, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 9:
143 can be fit into 340 2 times, resulting in a remainder of 54.
Put 2 as the next digit of the answer. 
Result so far: 5882.622
If we subtract 286 from 340, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final outcome is 5882.622, with a leftover of 0.0054.