51690 divided by 20 
We want to figure out the number of times 51690 can be divided by 20.

On to step 1:
When dividing 5 by 20, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 20

Advancing to step 2:
If we divide 51 by 20, we get 2 and a remainder of 11.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 40 from 51 and we're left with 11.
Take the next digit (6) from the dividend and append it to 11, then repeat: 116 / 20

Let's proceed to step 3:
20 goes into 116 5 times with a remainder of 16.
Put 5 as the next digit of the answer. 
Result so far: 25.0
If we subtract 100 from 116, we get 16.
Append the next digit (9) from the dividend to 16 and continue with: 169 / 20

On to step 4:
The number 20 fits into 169 8 times, leaving a remainder of 9.
The number 8 becomes the next digit in our result. 
Result so far: 258.0
If we take 160 away from 169, we end up with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 20

Going ahead to step 5:
When dividing 90 by 20, we get 4 with a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 2584.0
The remainder is 10 after subtracting 80 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 6:
20 goes into 100 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 2584.5
If we take 100 away from 100, 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.

Advancing to step 7:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 2584.5
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.

Moving on to step 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 2584.5
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.

Our division results in 2584.5 with a remaining 0.0.