Here are my top 5 reasons of getting the Casio fx-115ES PLUS scientific calculator, back to school calculator Fractions: @0:38 Square Roots: @3:58 Exponents: @6:46 System of Equations: @8:40 Quadratic Equations: @13:18 Perfect for FE and EIT exam Bonus features: youtube.com/watch?v=22_ZqYoOZfs Join my facebook group: facebook.com/groups/blackpenredpen Check out my site for more resources: www.blackpenredpen.com blackpenredpen