We divide 143491 by 20
We want to figure out the number of times 143491 can be divided by 20.

On to step 1:
When dividing 1 by 20, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 20

Step 2:
14 divided by 20 is 0 with a remainder of 14.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 14 to get 14.
Bring next digit (3) of the dividend behind the 14 and repeat the process: 143 / 20

Advancing to step 3:
The number 20 fits into 143 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we take 140 away from 143, we end up with 3.
Grab the next digit (4) from the dividend, add it to 3, then carry on: 34 / 20

Advancing to step 4:
If we divide 34 by 20, we get 1 and a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 71.0
Subtracting 20 from 34 leaves us with 14.
Take the next digit (9) from the dividend and append it to 14, then repeat: 149 / 20

Step 5:
20 can be fit into 149 7 times, resulting in a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 717.0
If we subtract 140 from 149, we get 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 20

Step 6:
91 divided by 20 is 4 with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 7174.0
If we take 80 away from 91, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
The number 20 fits into 110 5 times, leaving a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 7174.5
The remainder is 10 after subtracting 100 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 7174.55
The remainder is 0 after subtracting 100 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 7174.55 and a remainder of 0.0.