Three to get started (with the answers)
A printable sheet of simultaneous equations
Standard Form Questions
Practice and check the answers standard form
These instructions work on a CASIO fx-83GT PLUS, which is widely used in schools and will, if you learn to drive it with confidence, do a tremendous number of different sorts of Maths.
If you want the calculator to give all its answers in standard form, follow this sequence:
To type in a number that is in standard form, for example 4.5 x 10^12, use the button with x10x on it (it’s in the middle of the bottom row of buttons, and I will use square brackets to mean button) so the keystrokes you need, are 4.5 [x10x]12