Hi !
So basically all you need to do with an equation like this move the decimal.
And the direction you move it depends on the value of the largest digit as well as if it is larger or smaller than 0.
So lets look at 10 and make it 10.0 so its a decimal and make things a bit easier.
So 10.0 is just one digit moved in the decimal world. (100.0 would be 2, 1000.0 would be 3, and so on.)
And 10.0 is greater than 0.
Greater than 0 = Move decimal left
Less than 0 = Move decimal right
So now we know to move one space to the left.
512.3
>
One to the left
>
51.23
And its that easy, that is your answer.
I hope this helps!
If you have any questions or concerns please let me know!