A key release does not necessarily need to follow a key press, I.E. you can use release actions without making sure the keys they affect are actually pressed. Most applications will not react to that (unless you have one that is explicitly listening for a release).
E.G.
Release NumPad Decimal key
Release NumPad 8 key
Release NumPad 2 key
If you do prefer to check first, you can use the "Device State" tab of the "Begin a Conditional (If Statement) Block" action, E.G.
Begin Device State Check : Keyboard Key 'Numeric .' Is Pressed
Release NumPad Decimal key
End Condition
Begin Device State Check : Keyboard Key 'Numeric 8' Is Pressed
Release NumPad 8 key
End Condition
Begin Device State Check : Keyboard Key 'Numeric 2' Is Pressed
Release NumPad 2 key
End Condition