142170 ÷ 20 
We're looking to find how many times 20 goes into 142170.

Let's proceed to step 1:
The number 20 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 20

Moving on to step 2:
20 goes into 14 0 times with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 14, we get 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 20

On to step 3:
20 goes into 142 7 times with a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtracting 140 from 142 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 20

Moving on to step 4:
20 can be fit into 21 1 times, resulting in a remainder of 1.
The next digit of our result is 1. 
Result so far: 71.0
Subtract 20 from 21 to get 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 20

Going ahead to step 5:
20 can be fit into 17 0 times, resulting in a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 710.0
Subtract 0 from 17 to get 17.
Include the next digit (0) from the dividend after 17, then repeat: 170 / 20

Going ahead to step 6:
When dividing 170 by 20, we get 8 with a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 7108.0
If we subtract 160 from 170, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 7:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 7108.5
Subtracting 100 from 100 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7108.5
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7108.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 7108.5 with a remainder of 0.0.