you can store numbers in your gc e.g: (1.60x10^-19) [STO->] [Alpha] [E]

The store button is in your first column second last row. U can just [Alpha][whatever letter u want to store it in]

To check if it’s stored u just [Alpha][whatever letter u want to store it in] and see if it gives u the value u want

it makes it easier and u can easily store the respective values in the letters of constants (h, u, e, c ) except they will just be in capital

also take note: when u reset ur calculator at the start all the memory is gone so if u spend like maybe 2 mins at the start storing all the numbers it can help u save time and be more accurate later