We look at the division of 13101886 by 143 
The aim is to understand the frequency of 143 in 13101886.

Advancing to step 1:
1 divided by 143 is 0 with 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.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 143

On to step 2:
143 goes into 13 0 times with a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Take the next digit (1) from the dividend and append it to 13, then repeat: 131 / 143

Let's proceed to step 3:
131 divided by 143 is 0 with a remainder of 131.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 131 and we're left with 131.
Grab the next digit (0) from the dividend, add it to 131, then carry on: 1310 / 143

On to step 4:
143 can be fit into 1310 9 times, resulting in a remainder of 23.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 1287 from 1310 to get 23.
Grab the next digit (1) from the dividend, add it to 23, then carry on: 231 / 143

On to step 5:
143 goes into 231 1 times with a remainder of 88.
Write down 1 as next digit of the result. 
Result so far: 91.0
Subtract 143 from 231 to get 88.
Include the next digit (8) from the dividend after 88, then repeat: 888 / 143

Step 6:
888 divided by 143 is 6 with a remainder of 30.
Use 6 as the next digit of our solution. 
Result so far: 916.0
Subtracting 858 from 888 leaves us with 30.
Include the next digit (8) from the dividend after 30, then repeat: 308 / 143

Advancing to step 7:
If we divide 308 by 143, we get 2 and a remainder of 22.
Put 2 as the next digit of the answer. 
Result so far: 9162.0
Subtracting 286 from 308 leaves us with 22.
Fetch the next digit (6) from the dividend, attach it to 22 and continue: 226 / 143

Step 8:
143 can be fit into 226 1 times, resulting in a remainder of 83.
Write down 1 as next digit of the result. 
Result so far: 91621.0
If we subtract 143 from 226, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

On to step 9:
143 can be fit into 830 5 times, resulting in a remainder of 115.
The number 5 becomes the next digit in our result. 
Result so far: 91621.5
Subtracting 715 from 830 leaves us with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Let's proceed to step 10:
1150 divided by 143 is 8 with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 91621.58
Subtract 1144 from 1150 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 11:
143 goes into 60 0 times with a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 91621.58
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 12:
When dividing 600 by 143, we get 4 with a remainder of 28.
The number 4 becomes the next digit in our result. 
Result so far: 91621.5804
If we take 572 away from 600, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 13:
When dividing 280 by 143, we get 1 with a remainder of 137.
Put 1 as the next digit of the answer. 
Result so far: 91621.58041
Subtract 143 from 280 to get 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Step 14:
If we divide 1370 by 143, we get 9 and a remainder of 83.
The number 9 becomes the next digit in our result. 
Result so far: 91621.580419
Deduct 1287 from 1370 and we're left with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 15:
The number 143 fits into 830 5 times, leaving a remainder of 115.
Record the quotient 5 as the next digit in the result. 
Result so far: 91621.5804195
If we take 715 away from 830, we end up with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Moving on to step 16:
143 goes into 1150 8 times with a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 91621.58041958
If we take 1144 away from 1150, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final outcome is 91621.58041958, with a leftover of 6e-09.