We look at the division of 20180390 by 143 
We're looking to find how many times 143 goes into 20180390.

On to step 1:
143 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 143

Advancing to step 2:
20 divided by 143 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Take the next digit (1) from the dividend and append it to 20, then repeat: 201 / 143

Let's proceed to step 3:
The number 143 fits into 201 1 times, leaving a remainder of 58.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 143 from 201 and we're left with 58.
Include the next digit (8) from the dividend after 58, then repeat: 588 / 143

Step 4:
The number 143 fits into 588 4 times, leaving a remainder of 16.
The next digit of our result is 4. 
Result so far: 14.0
If we subtract 572 from 588, we get 16.
Include the next digit (0) from the dividend after 16, then repeat: 160 / 143

Let's proceed to step 5:
143 goes into 160 1 times with a remainder of 17.
Put 1 as the next digit of the answer. 
Result so far: 141.0
If we subtract 143 from 160, we get 17.
Grab the next digit (3) from the dividend, add it to 17, then carry on: 173 / 143

Going ahead to step 6:
When dividing 173 by 143, we get 1 with a remainder of 30.
Write down 1 as next digit of the result. 
Result so far: 1411.0
Subtract 143 from 173 to get 30.
Include the next digit (9) from the dividend after 30, then repeat: 309 / 143

Moving on to step 7:
When dividing 309 by 143, we get 2 with a remainder of 23.
Put 2 as the next digit of the answer. 
Result so far: 14112.0
If we take 286 away from 309, we end up with 23.
Append the next digit (0) from the dividend to 23 and continue with: 230 / 143

On to step 8:
The number 143 fits into 230 1 times, leaving a remainder of 87.
Record the quotient 1 as the next digit in the result. 
Result so far: 141121.0
Subtract 143 from 230 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Step 9:
143 can be fit into 870 6 times, resulting in a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 141121.6
If we subtract 858 from 870, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 10:
If we divide 120 by 143, we get 0 and a remainder of 120.
Record the quotient 0 as the next digit in the result. 
Result so far: 141121.6
If we subtract 0 from 120, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 11:
143 goes into 1200 8 times with a remainder of 56.
Write down 8 as next digit of the result. 
Result so far: 141121.608
If we take 1144 away from 1200, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 12:
When dividing 560 by 143, we get 3 with a remainder of 131.
Put 3 as the next digit of the answer. 
Result so far: 141121.6083
If we subtract 429 from 560, we get 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Step 13:
143 goes into 1310 9 times with a remainder of 23.
Put 9 as the next digit of the answer. 
Result so far: 141121.60839
Deduct 1287 from 1310 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 14:
The number 143 fits into 230 1 times, leaving a remainder of 87.
The next digit of our result is 1. 
Result so far: 141121.608391
Deduct 143 from 230 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Moving on to step 15:
870 divided by 143 is 6 with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 141121.6083916
If we take 858 away from 870, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 16:
143 can be fit into 120 0 times, resulting in a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 141121.6083916
If we subtract 0 from 120, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Our division results in 141121.6083916 with a remaining 1.2e-07.