We look at the division of 351742 by 20 
Let's see how many times 20 fits into 351742.

Moving on to step 1:
3 divided by 20 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 20

Moving on to step 2:
If we divide 35 by 20, we get 1 and a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 20 away from 35, we end up with 15.
Bring next digit (1) of the dividend behind the 15 and repeat the process: 151 / 20

On to step 3:
The number 20 fits into 151 7 times, leaving a remainder of 11.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
The remainder is 11 after subtracting 140 from 151.
Take the next digit (7) from the dividend and append it to 11, then repeat: 117 / 20

Going ahead to step 4:
When dividing 117 by 20, we get 5 with a remainder of 17.
Put 5 as the next digit of the answer. 
Result so far: 175.0
If we take 100 away from 117, we end up with 17.
Append the next digit (4) from the dividend to 17 and continue with: 174 / 20

Moving on to step 5:
20 goes into 174 8 times with a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 1758.0
Subtract 160 from 174 to get 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 20

On to step 6:
When dividing 142 by 20, we get 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 17587.0
If we take 140 away from 142, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 7:
The number 20 fits into 20 1 times, leaving a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 17587.1
Deduct 20 from 20 and we're left 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.

Advancing to step 8:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 17587.1
Subtracting 0 from 0 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.

Going ahead 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: 17587.1
If we take 0 away from 0, we end up 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.

The quotient of the division is 17587.1, and the remainder is 0.0.