We look at the division of 151717 by 20 
We want to figure out the number of times 151717 can be divided by 20.

Let's proceed to step 1:
20 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 20

Step 2:
The number 20 fits into 15 0 times, leaving a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Bring next digit (1) of the dividend behind the 15 and repeat the process: 151 / 20

Step 3:
The number 20 fits into 151 7 times, leaving a remainder of 11.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 11 after subtracting 140 from 151.
Grab the next digit (7) from the dividend, add it to 11, then carry on: 117 / 20

Step 4:
The number 20 fits into 117 5 times, leaving a remainder of 17.
The next digit of our result is 5. 
Result so far: 75.0
The remainder is 17 after subtracting 100 from 117.
Grab the next digit (1) from the dividend, add it to 17, then carry on: 171 / 20

On to step 5:
171 divided by 20 is 8 with a remainder of 11.
Put 8 as the next digit of the answer. 
Result so far: 758.0
Deduct 160 from 171 and we're left with 11.
Fetch the next digit (7) from the dividend, attach it to 11 and continue: 117 / 20

Moving on to step 6:
20 goes into 117 5 times with a remainder of 17.
The next digit of our result is 5. 
Result so far: 7585.0
If we subtract 100 from 117, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 7:
When dividing 170 by 20, we get 8 with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 7585.8
If we take 160 away from 170, we end up with 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 8:
100 divided by 20 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 7585.85
Deduct 100 from 100 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.

Step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 7585.85
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.

Advancing to step 10:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 7585.85
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.

The final result is 7585.85 with a remainder of 0.0.